From efa7ff1d39c6dfdaefd2984e8c37b2f38067b947 Mon Sep 17 00:00:00 2001
From: Roger Oriol <rogi23696@gmail.com>
Date: Thu, 9 Oct 2025 20:19:20 +0200
Subject: [PATCH] frontend implementation

---
 .dockerignore                         |   37 +
 Dockerfile                            |   66 ++
 backend/database.js                   |   29 +-
 backend/package-lock.json             | 1392 ++++++++++++++++++++++++-
 backend/package.json                  |    7 +-
 backend/server.js                     |    8 +-
 data/gym-tracker.db                   |  Bin 0 -> 12288 bytes
 frontend/api.js                       |  145 +++
 frontend/app.js                       |  247 +++++
 frontend/heatmap.js                   |  132 +++
 frontend/index.html                   |  145 ++-
 frontend/muscleGroups.js              |  166 +++
 frontend/styles.css                   |  411 ++++++++
 kubernetes/README.md                  |  158 +++
 kubernetes/deployment.yaml            |   62 ++
 kubernetes/ingress.yaml               |   30 +
 kubernetes/persistentvolumeclaim.yaml |   13 +
 kubernetes/service.yaml               |   15 +
 nginx/nginx.conf                      |   80 ++
 19 files changed, 3072 insertions(+), 71 deletions(-)
 create mode 100644 .dockerignore
 create mode 100644 data/gym-tracker.db
 create mode 100644 frontend/heatmap.js
 create mode 100644 frontend/muscleGroups.js
 create mode 100644 kubernetes/README.md
 create mode 100644 kubernetes/deployment.yaml
 create mode 100644 kubernetes/ingress.yaml
 create mode 100644 kubernetes/persistentvolumeclaim.yaml
 create mode 100644 kubernetes/service.yaml

diff --git a/.dockerignore b/.dockerignore
new file mode 100644
index 0000000..c4e2350
--- /dev/null
+++ b/.dockerignore
@@ -0,0 +1,37 @@
+# Git files
+.git
+.gitignore
+.jj
+
+# Node modules (will be installed in container)
+node_modules
+backend/node_modules
+
+# Database files (use volume mount for persistence)
+data/
+*.db
+*.db-journal
+
+# Documentation and planning
+README.md
+PLAN.md
+CLAUDE.md
+
+# Development files
+.vscode
+.idea
+*.log
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# OS files
+.DS_Store
+Thumbs.db
+
+# Temporary files
+*.tmp
+*.temp
+*.swp
+*.swo
+*~
diff --git a/Dockerfile b/Dockerfile
index e69de29..5175845 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -0,0 +1,66 @@
+# Multi-stage build for Gym Tracker application
+# Stage 1: Dependencies
+FROM node:20-alpine AS dependencies
+
+WORKDIR /app
+
+# Copy backend package files
+COPY backend/package*.json ./backend/
+
+# Install backend dependencies
+RUN cd backend && npm ci --only=production
+
+# Stage 2: Final image
+FROM node:20-alpine
+
+# Install nginx
+RUN apk add --no-cache nginx
+
+# Create app directory
+WORKDIR /app
+
+# Copy backend files and dependencies
+COPY --from=dependencies /app/backend/node_modules ./backend/node_modules
+COPY backend/package*.json ./backend/
+COPY backend/*.js ./backend/
+
+# Copy frontend files to nginx html directory
+COPY frontend/ /usr/share/nginx/html/
+
+# Copy nginx configuration
+COPY nginx/nginx.conf /etc/nginx/nginx.conf
+
+# Create data directory for SQLite database
+RUN mkdir -p /app/data && chmod 755 /app/data
+
+# Create nginx directories and set permissions
+RUN mkdir -p /var/log/nginx /var/lib/nginx /run/nginx && \
+    chown -R nginx:nginx /var/log/nginx /var/lib/nginx /run/nginx
+
+# Create startup script
+RUN echo '#!/bin/sh' > /app/start.sh && \
+    echo 'echo "Starting Gym Tracker application..."' >> /app/start.sh && \
+    echo '' >> /app/start.sh && \
+    echo '# Start nginx in background' >> /app/start.sh && \
+    echo 'echo "Starting nginx..."' >> /app/start.sh && \
+    echo 'nginx' >> /app/start.sh && \
+    echo '' >> /app/start.sh && \
+    echo '# Start backend server' >> /app/start.sh && \
+    echo 'echo "Starting backend server on port 3000..."' >> /app/start.sh && \
+    echo 'cd /app/backend' >> /app/start.sh && \
+    echo 'exec node server.js' >> /app/start.sh && \
+    chmod +x /app/start.sh
+
+# Expose ports
+EXPOSE 80 3000
+
+# Set environment variables
+ENV NODE_ENV=production
+ENV PORT=3000
+
+# Health check
+HEALTHCHECK --interval=30s --timeout=3s --start-period=10s --retries=3 \
+    CMD wget --quiet --tries=1 --spider http://localhost/health || exit 1
+
+# Run startup script
+CMD ["/app/start.sh"]
diff --git a/backend/database.js b/backend/database.js
index 74253af..a6ec446 100644
--- a/backend/database.js
+++ b/backend/database.js
@@ -1,8 +1,8 @@
-const sqlite3 = require('sqlite3').verbose();
-const path = require('path');
+import sqlite3 from 'sqlite3';
+import path from 'path';
 
 // Database file path
-const DB_PATH = path.join(__dirname, '../data/gym-tracker.db');
+const DB_PATH = path.join('../data/gym-tracker.db');
 
 // Initialize database connection
 const db = new sqlite3.Database(DB_PATH, (err) => {
@@ -15,7 +15,7 @@ const db = new sqlite3.Database(DB_PATH, (err) => {
 });
 
 // Create tables if they don't exist
-function initializeDatabase() {
+export function initializeDatabase() {
   const createTableSQL = `
     CREATE TABLE IF NOT EXISTS sessions (
       id TEXT PRIMARY KEY,
@@ -34,7 +34,7 @@ function initializeDatabase() {
 }
 
 // Get all sessions
-function getAllSessions(callback) {
+export function getAllSessions(callback) {
   const sql = 'SELECT * FROM sessions ORDER BY date DESC';
   db.all(sql, [], (err, rows) => {
     if (err) {
@@ -52,7 +52,7 @@ function getAllSessions(callback) {
 }
 
 // Get session by ID
-function getSessionById(id, callback) {
+export function getSessionById(id, callback) {
   const sql = 'SELECT * FROM sessions WHERE id = ?';
   db.get(sql, [id], (err, row) => {
     if (err) {
@@ -71,7 +71,7 @@ function getSessionById(id, callback) {
 }
 
 // Create new session
-function createSession(id, date, muscleGroups, callback) {
+export function createSession(id, date, muscleGroups, callback) {
   const sql = 'INSERT INTO sessions (id, date, muscle_groups) VALUES (?, ?, ?)';
   const muscleGroupsJSON = JSON.stringify(muscleGroups);
 
@@ -85,7 +85,7 @@ function createSession(id, date, muscleGroups, callback) {
 }
 
 // Update existing session
-function updateSession(id, date, muscleGroups, callback) {
+export function updateSession(id, date, muscleGroups, callback) {
   const sql = 'UPDATE sessions SET date = ?, muscle_groups = ? WHERE id = ?';
   const muscleGroupsJSON = JSON.stringify(muscleGroups);
 
@@ -101,7 +101,7 @@ function updateSession(id, date, muscleGroups, callback) {
 }
 
 // Delete session
-function deleteSession(id, callback) {
+export function deleteSession(id, callback) {
   const sql = 'DELETE FROM sessions WHERE id = ?';
 
   db.run(sql, [id], function(err) {
@@ -116,7 +116,7 @@ function deleteSession(id, callback) {
 }
 
 // Close database connection
-function closeDatabase() {
+export function closeDatabase() {
   db.close((err) => {
     if (err) {
       console.error('Error closing database:', err.message);
@@ -125,12 +125,3 @@ function closeDatabase() {
     }
   });
 }
-
-module.exports = {
-  getAllSessions,
-  getSessionById,
-  createSession,
-  updateSession,
-  deleteSession,
-  closeDatabase
-};
diff --git a/backend/package-lock.json b/backend/package-lock.json
index 5b53b99..1315c02 100644
--- a/backend/package-lock.json
+++ b/backend/package-lock.json
@@ -9,9 +9,62 @@
       "version": "1.0.0",
       "license": "ISC",
       "dependencies": {
-        "express": "^5.1.0"
+        "cors": "^2.8.5",
+        "express": "^5.1.0",
+        "sqlite3": "^5.1.7",
+        "uuid": "^13.0.0"
       }
     },
+    "node_modules/@gar/promisify": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/@gar/promisify/-/promisify-1.1.3.tgz",
+      "integrity": "sha512-k2Ty1JcVojjJFwrg/ThKi2ujJ7XNLYaFGNB/bWT9wGR+oSMJHMa5w+CUq6p/pVrKeNNgA7pCqEcjSnHVoqJQFw==",
+      "license": "MIT",
+      "optional": true
+    },
+    "node_modules/@npmcli/fs": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/@npmcli/fs/-/fs-1.1.1.tgz",
+      "integrity": "sha512-8KG5RD0GVP4ydEzRn/I4BNDuxDtqVbOdm8675T49OIG/NGhaK0pjPX7ZcDlvKYbA+ulvVK3ztfcF4uBdOxuJbQ==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "@gar/promisify": "^1.0.1",
+        "semver": "^7.3.5"
+      }
+    },
+    "node_modules/@npmcli/move-file": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@npmcli/move-file/-/move-file-1.1.2.tgz",
+      "integrity": "sha512-1SUf/Cg2GzGDyaf15aR9St9TWlb+XvbZXWpDx8YKs7MLzMH/BCeopv+y9vzrzgkfykCGuWOlSu3mZhj2+FQcrg==",
+      "deprecated": "This functionality has been moved to @npmcli/fs",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "mkdirp": "^1.0.4",
+        "rimraf": "^3.0.2"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/@tootallnate/once": {
+      "version": "1.1.2",
+      "resolved": "https://registry.npmjs.org/@tootallnate/once/-/once-1.1.2.tgz",
+      "integrity": "sha512-RbzJvlNzmRq5c3O09UipeuXno4tA1FE6ikOjxZK0tuxVv3412l64l5t1W5pj4+rJq9vpkm/kwiR07aZXnsKPxw==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/abbrev": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz",
+      "integrity": "sha512-nne9/IiQ/hzIhY6pdDnbBtz7DjPTKrY00P/zvPSm5pOFkl6xuGrGnXn/VtTNNfNtAfZ9/1RtehkszU9qcTii0Q==",
+      "license": "ISC",
+      "optional": true
+    },
     "node_modules/accepts": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/accepts/-/accepts-2.0.0.tgz",
@@ -25,6 +78,125 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/agent-base": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/agentkeepalive": {
+      "version": "4.6.0",
+      "resolved": "https://registry.npmjs.org/agentkeepalive/-/agentkeepalive-4.6.0.tgz",
+      "integrity": "sha512-kja8j7PjmncONqaTsB8fQ+wE2mSU2DJ9D4XKoJ5PFWIdRMa6SLSN1ff4mOr4jCbfRSsxR4keIiySJU0N9T5hIQ==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "humanize-ms": "^1.2.1"
+      },
+      "engines": {
+        "node": ">= 8.0.0"
+      }
+    },
+    "node_modules/aggregate-error": {
+      "version": "3.1.0",
+      "resolved": "https://registry.npmjs.org/aggregate-error/-/aggregate-error-3.1.0.tgz",
+      "integrity": "sha512-4I7Td01quW/RpocfNayFdFVk1qSuoh0E7JrbRJ16nH01HhKFQ88INq9Sd+nd72zqRySlr9BmDA8xlEJ6vJMrYA==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "clean-stack": "^2.0.0",
+        "indent-string": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/ansi-regex": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/ansi-regex/-/ansi-regex-5.0.1.tgz",
+      "integrity": "sha512-quJQXlTSUGL2LH9SUXo8VwsY4soanhgo6LNSm84E1LBcE8s3O0wpdiRzyR9z/ZZJMlMWv37qOOb9pdJlMUEKFQ==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/aproba": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/aproba/-/aproba-2.1.0.tgz",
+      "integrity": "sha512-tLIEcj5GuR2RSTnxNKdkK0dJ/GrC7P38sUkiDmDuHfsHmbagTFAxDVIBltoklXEVIQ/f14IL8IMJ5pn9Hez1Ew==",
+      "license": "ISC",
+      "optional": true
+    },
+    "node_modules/are-we-there-yet": {
+      "version": "3.0.1",
+      "resolved": "https://registry.npmjs.org/are-we-there-yet/-/are-we-there-yet-3.0.1.tgz",
+      "integrity": "sha512-QZW4EDmGwlYur0Yyf/b2uGucHQMa8aFUP7eu9ddR73vvhFyt4V0Vl3QHPcTNJ8l6qYOBdxgXdnBXQrHilfRQBg==",
+      "deprecated": "This package is no longer supported.",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "delegates": "^1.0.0",
+        "readable-stream": "^3.6.0"
+      },
+      "engines": {
+        "node": "^12.13.0 || ^14.15.0 || >=16.0.0"
+      }
+    },
+    "node_modules/balanced-match": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/balanced-match/-/balanced-match-1.0.2.tgz",
+      "integrity": "sha512-3oSeUO0TMV67hN1AmbXsK4yaqU7tjiHlbxRDZOpH0KW9+CeX4bRAaX0Anxt0tx2MrpRpWwQaPwIlISEJhYU5Pw==",
+      "license": "MIT",
+      "optional": true
+    },
+    "node_modules/base64-js": {
+      "version": "1.5.1",
+      "resolved": "https://registry.npmjs.org/base64-js/-/base64-js-1.5.1.tgz",
+      "integrity": "sha512-AKpaYlHn8t4SVbOHCy+b5+KKgvR4vrsD8vbvrbiQJps7fKDTkjkDry6ji0rUJjC0kzbNePLwzxq8iypo41qeWA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/bindings": {
+      "version": "1.5.0",
+      "resolved": "https://registry.npmjs.org/bindings/-/bindings-1.5.0.tgz",
+      "integrity": "sha512-p2q/t/mhvuOj/UeLlV6566GD/guowlr0hHxClI0W9m7MWYkL1F0hLo+0Aexs9HSPCtR1SXQ0TD3MMKrXZajbiQ==",
+      "license": "MIT",
+      "dependencies": {
+        "file-uri-to-path": "1.0.0"
+      }
+    },
+    "node_modules/bl": {
+      "version": "4.1.0",
+      "resolved": "https://registry.npmjs.org/bl/-/bl-4.1.0.tgz",
+      "integrity": "sha512-1W07cM9gS6DcLperZfFSj+bWLtaPGSOHWhPiGzXmvVJbRLdG82sH/Kn8EtW1VqWVA54AKf2h5k5BbnIbwF3h6w==",
+      "license": "MIT",
+      "dependencies": {
+        "buffer": "^5.5.0",
+        "inherits": "^2.0.4",
+        "readable-stream": "^3.4.0"
+      }
+    },
     "node_modules/body-parser": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/body-parser/-/body-parser-2.2.0.tgz",
@@ -45,6 +217,41 @@
         "node": ">=18"
       }
     },
+    "node_modules/brace-expansion": {
+      "version": "1.1.12",
+      "resolved": "https://registry.npmjs.org/brace-expansion/-/brace-expansion-1.1.12.tgz",
+      "integrity": "sha512-9T9UjW3r0UW5c1Q7GTwllptXwhvYmEzFhzMfZ9H7FQWt+uZePjZPjBP/W1ZEyZ1twGWom5/56TF4lPcqjnDHcg==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "balanced-match": "^1.0.0",
+        "concat-map": "0.0.1"
+      }
+    },
+    "node_modules/buffer": {
+      "version": "5.7.1",
+      "resolved": "https://registry.npmjs.org/buffer/-/buffer-5.7.1.tgz",
+      "integrity": "sha512-EHcyIPBQ4BSGlvjB16k5KgAJ27CIsHY/2JBmCRReo48y9rQ3MaUzWX3KVlBa4U7MyX02HdVj0K7C3WaB3ju7FQ==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "base64-js": "^1.3.1",
+        "ieee754": "^1.1.13"
+      }
+    },
     "node_modules/bytes": {
       "version": "3.1.2",
       "resolved": "https://registry.npmjs.org/bytes/-/bytes-3.1.2.tgz",
@@ -54,6 +261,36 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/cacache": {
+      "version": "15.3.0",
+      "resolved": "https://registry.npmjs.org/cacache/-/cacache-15.3.0.tgz",
+      "integrity": "sha512-VVdYzXEn+cnbXpFgWs5hTT7OScegHVmLhJIR8Ufqk3iFD6A6j5iSX1KuBTfNEv4tdJWE2PzA6IVFtcLC7fN9wQ==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "@npmcli/fs": "^1.0.0",
+        "@npmcli/move-file": "^1.0.1",
+        "chownr": "^2.0.0",
+        "fs-minipass": "^2.0.0",
+        "glob": "^7.1.4",
+        "infer-owner": "^1.0.4",
+        "lru-cache": "^6.0.0",
+        "minipass": "^3.1.1",
+        "minipass-collect": "^1.0.2",
+        "minipass-flush": "^1.0.5",
+        "minipass-pipeline": "^1.2.2",
+        "mkdirp": "^1.0.3",
+        "p-map": "^4.0.0",
+        "promise-inflight": "^1.0.1",
+        "rimraf": "^3.0.2",
+        "ssri": "^8.0.1",
+        "tar": "^6.0.2",
+        "unique-filename": "^1.1.1"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
     "node_modules/call-bind-apply-helpers": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/call-bind-apply-helpers/-/call-bind-apply-helpers-1.0.2.tgz",
@@ -83,6 +320,49 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/chownr": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-2.0.0.tgz",
+      "integrity": "sha512-bIomtDF5KGpdogkLd9VspvFzk9KfpyyGlS8YFVZl7TGPBHL5snIOnxeshwVgPteQ9b4Eydl+pVbIyE1DcvCWgQ==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/clean-stack": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/clean-stack/-/clean-stack-2.2.0.tgz",
+      "integrity": "sha512-4diC9HaTE+KRAMWhDhrGOECgWZxoevMc5TlkObMqNSsVU62PYzXZ/SMTjzyGAFF1YusgxGcSWTEXBhp0CPwQ1A==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/color-support": {
+      "version": "1.1.3",
+      "resolved": "https://registry.npmjs.org/color-support/-/color-support-1.1.3.tgz",
+      "integrity": "sha512-qiBjkpbMLO/HL68y+lh4q0/O1MZFj2RX6X/KmMa3+gJD3z+WwI1ZzDHysvqHGS3mP6mznPckpXmw1nI9cJjyRg==",
+      "license": "ISC",
+      "optional": true,
+      "bin": {
+        "color-support": "bin.js"
+      }
+    },
+    "node_modules/concat-map": {
+      "version": "0.0.1",
+      "resolved": "https://registry.npmjs.org/concat-map/-/concat-map-0.0.1.tgz",
+      "integrity": "sha512-/Srv4dswyQNBfohGpz9o6Yb3Gz3SrUDqBH5rTuhGR7ahtlbYKnVxw2bCFMRljaA7EXHaXZ8wsHdodFvbkhKmqg==",
+      "license": "MIT",
+      "optional": true
+    },
+    "node_modules/console-control-strings": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/console-control-strings/-/console-control-strings-1.1.0.tgz",
+      "integrity": "sha512-ty/fTekppD2fIwRvnZAVdeOiGd1c7YXEixbgJTNzqcxJWKQnjJ/V1bNEEE6hygpM3WjwHFUVK6HTjWSzV4a8sQ==",
+      "license": "ISC",
+      "optional": true
+    },
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@@ -406,6 +892,45 @@
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+      "integrity": "sha512-9u/sniCrY3D5WdsERHzHE4G2YCXqoG5FTHUiCC4SIbr6XcLZBY05ya9EKjYek9O5xOAwjGq+1JdGBAS7Q9ScoA==",
+      "license": "MIT",
+      "dependencies": {
+        "inherits": "^2.0.3",
+        "string_decoder": "^1.1.1",
+        "util-deprecate": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/retry": {
+      "version": "0.12.0",
+      "resolved": "https://registry.npmjs.org/retry/-/retry-0.12.0.tgz",
+      "integrity": "sha512-9LkiTwjUh6rT555DtE9rTX+BKByPfrMzEAtnlEtdEwr3Nkffwiihqe2bWADg+OQRjt9gl6ICdmB/ZFDCGAtSow==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">= 4"
+      }
+    },
+    "node_modules/rimraf": {
+      "version": "3.0.2",
+      "resolved": "https://registry.npmjs.org/rimraf/-/rimraf-3.0.2.tgz",
+      "integrity": "sha512-JZkJMZkAGFFPP2YqXZXPbMlMBgsxzE8ILs4lMIX/2o0L9UBw9O/Y3o6wFw/i9YLapcUJWwqbi3kdxIPdC62TIA==",
+      "deprecated": "Rimraf versions prior to v4 are no longer supported",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "glob": "^7.1.3"
+      },
+      "bin": {
+        "rimraf": "bin.js"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/isaacs"
+      }
+    },
     "node_modules/router": {
       "version": "2.2.0",
       "resolved": "https://registry.npmjs.org/router/-/router-2.2.0.tgz",
@@ -667,6 +1719,18 @@
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       "license": "MIT"
     },
+    "node_modules/semver": {
+      "version": "7.7.2",
+      "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.2.tgz",
+      "integrity": "sha512-RF0Fw+rO5AMf9MAyaRXI4AV0Ulj5lMHqVxxdSgiVbixSCXoEmmX/jk0CuJw4+3SqroYO9VoUh+HcuJivvtJemA==",
+      "license": "ISC",
+      "bin": {
+        "semver": "bin/semver.js"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
     "node_modules/send": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/send/-/send-1.2.0.tgz",
@@ -704,6 +1768,13 @@
         "node": ">= 18"
       }
     },
+    "node_modules/set-blocking": {
+      "version": "2.0.0",
+      "resolved": "https://registry.npmjs.org/set-blocking/-/set-blocking-2.0.0.tgz",
+      "integrity": "sha512-KiKBS8AnWGEyLzofFfmvKwpdPzqiy16LvQfK3yv/fVH7Bj13/wl3JSR1J+rfgRE9q7xUJK4qvgS8raSOeLUehw==",
+      "license": "ISC",
+      "optional": true
+    },
     "node_modules/setprototypeof": {
       "version": "1.2.0",
       "resolved": "https://registry.npmjs.org/setprototypeof/-/setprototypeof-1.2.0.tgz",
@@ -782,6 +1853,136 @@
         "url": "https://github.com/sponsors/ljharb"
       }
     },
+    "node_modules/signal-exit": {
+      "version": "3.0.7",
+      "resolved": "https://registry.npmjs.org/signal-exit/-/signal-exit-3.0.7.tgz",
+      "integrity": "sha512-wnD2ZE+l+SPC/uoS0vXeE9L1+0wuaMqKlfz9AMUo38JsyLSBWSFcHR1Rri62LZc12vLr1gb3jl7iwQhgwpAbGQ==",
+      "license": "ISC",
+      "optional": true
+    },
+    "node_modules/simple-concat": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/simple-concat/-/simple-concat-1.0.1.tgz",
+      "integrity": "sha512-cSFtAPtRhljv69IK0hTVZQ+OfE9nePi/rtJmw5UjHeVyVroEqJXP1sFztKUy1qU+xvz3u/sfYJLa947b7nAN2Q==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT"
+    },
+    "node_modules/simple-get": {
+      "version": "4.0.1",
+      "resolved": "https://registry.npmjs.org/simple-get/-/simple-get-4.0.1.tgz",
+      "integrity": "sha512-brv7p5WgH0jmQJr1ZDDfKDOSeWWg+OVypG99A/5vYGPqJ6pxiaHLy8nxtFjBA7oMa01ebA9gfh1uMCFqOuXxvA==",
+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
+        {
+          "type": "patreon",
+          "url": "https://www.patreon.com/feross"
+        },
+        {
+          "type": "consulting",
+          "url": "https://feross.org/support"
+        }
+      ],
+      "license": "MIT",
+      "dependencies": {
+        "decompress-response": "^6.0.0",
+        "once": "^1.3.1",
+        "simple-concat": "^1.0.0"
+      }
+    },
+    "node_modules/smart-buffer": {
+      "version": "4.2.0",
+      "resolved": "https://registry.npmjs.org/smart-buffer/-/smart-buffer-4.2.0.tgz",
+      "integrity": "sha512-94hK0Hh8rPqQl2xXc3HsaBoOXKV20MToPkcXvwbISWLEs+64sBq5kFgn2kJDHb1Pry9yrP0dxrCI9RRci7RXKg==",
+      "license": "MIT",
+      "optional": true,
+      "engines": {
+        "node": ">= 6.0.0",
+        "npm": ">= 3.0.0"
+      }
+    },
+    "node_modules/socks": {
+      "version": "2.8.7",
+      "resolved": "https://registry.npmjs.org/socks/-/socks-2.8.7.tgz",
+      "integrity": "sha512-HLpt+uLy/pxB+bum/9DzAgiKS8CX1EvbWxI4zlmgGCExImLdiad2iCwXT5Z4c9c3Eq8rP2318mPW2c+QbtjK8A==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "ip-address": "^10.0.1",
+        "smart-buffer": "^4.2.0"
+      },
+      "engines": {
+        "node": ">= 10.0.0",
+        "npm": ">= 3.0.0"
+      }
+    },
+    "node_modules/socks-proxy-agent": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/socks-proxy-agent/-/socks-proxy-agent-6.2.1.tgz",
+      "integrity": "sha512-a6KW9G+6B3nWZ1yB8G7pJwL3ggLy1uTzKAgCb7ttblwqdz9fMGJUuTy3uFzEP48FAs9FLILlmzDlE2JJhVQaXQ==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "agent-base": "^6.0.2",
+        "debug": "^4.3.3",
+        "socks": "^2.6.2"
+      },
+      "engines": {
+        "node": ">= 10"
+      }
+    },
+    "node_modules/sqlite3": {
+      "version": "5.1.7",
+      "resolved": "https://registry.npmjs.org/sqlite3/-/sqlite3-5.1.7.tgz",
+      "integrity": "sha512-GGIyOiFaG+TUra3JIfkI/zGP8yZYLPQ0pl1bH+ODjiX57sPhrLU5sQJn1y9bDKZUFYkX1crlrPfSYt0BKKdkog==",
+      "hasInstallScript": true,
+      "license": "BSD-3-Clause",
+      "dependencies": {
+        "bindings": "^1.5.0",
+        "node-addon-api": "^7.0.0",
+        "prebuild-install": "^7.1.1",
+        "tar": "^6.1.11"
+      },
+      "optionalDependencies": {
+        "node-gyp": "8.x"
+      },
+      "peerDependencies": {
+        "node-gyp": "8.x"
+      },
+      "peerDependenciesMeta": {
+        "node-gyp": {
+          "optional": true
+        }
+      }
+    },
+    "node_modules/ssri": {
+      "version": "8.0.1",
+      "resolved": "https://registry.npmjs.org/ssri/-/ssri-8.0.1.tgz",
+      "integrity": "sha512-97qShzy1AiyxvPNIkLWoGua7xoQzzPjQ0HAH4B0rWKo7SZ6USuPcrUiAFrws0UH8RrbWmgq3LMTObhPIHbbBeQ==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "minipass": "^3.1.1"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
     "node_modules/statuses": {
       "version": "2.0.2",
       "resolved": "https://registry.npmjs.org/statuses/-/statuses-2.0.2.tgz",
@@ -791,6 +1992,112 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/string_decoder": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.3.0.tgz",
+      "integrity": "sha512-hkRX8U1WjJFd8LsDJ2yQ/wWWxaopEsABU1XfkM8A+j0+85JAGppt16cr1Whg6KIbb4okU6Mql6BOj+uup/wKeA==",
+      "license": "MIT",
+      "dependencies": {
+        "safe-buffer": "~5.2.0"
+      }
+    },
+    "node_modules/string-width": {
+      "version": "4.2.3",
+      "resolved": "https://registry.npmjs.org/string-width/-/string-width-4.2.3.tgz",
+      "integrity": "sha512-wKyQRQpjJ0sIp62ErSZdGsjMJWsap5oRNihHhu6G7JVO/9jIB6UyevL+tXuOqrng8j/cxKTWyWUwvSTriiZz/g==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "emoji-regex": "^8.0.0",
+        "is-fullwidth-code-point": "^3.0.0",
+        "strip-ansi": "^6.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-ansi": {
+      "version": "6.0.1",
+      "resolved": "https://registry.npmjs.org/strip-ansi/-/strip-ansi-6.0.1.tgz",
+      "integrity": "sha512-Y38VPSHcqkFrCpFnQ9vuSXmquuv5oXOKpGeT6aGrr3o3Gc9AlVa6JBfUSOCnbxGGZF+/0ooI7KrPuUSztUdU5A==",
+      "license": "MIT",
+      "optional": true,
+      "dependencies": {
+        "ansi-regex": "^5.0.1"
+      },
+      "engines": {
+        "node": ">=8"
+      }
+    },
+    "node_modules/strip-json-comments": {
+      "version": "2.0.1",
+      "resolved": "https://registry.npmjs.org/strip-json-comments/-/strip-json-comments-2.0.1.tgz",
+      "integrity": "sha512-4gB8na07fecVVkOI6Rs4e7T6NOTki5EmL7TUduTs6bu3EdnSycntVJ4re8kgZA+wx9IueI2Y11bfbgwtzuE0KQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=0.10.0"
+      }
+    },
+    "node_modules/tar": {
+      "version": "6.2.1",
+      "resolved": "https://registry.npmjs.org/tar/-/tar-6.2.1.tgz",
+      "integrity": "sha512-DZ4yORTwrbTj/7MZYq2w+/ZFdI6OZ/f9SFHR+71gIVUZhOQPHzVCLpvRnPgyaMpfWxxk/4ONva3GQSyNIKRv6A==",
+      "license": "ISC",
+      "dependencies": {
+        "chownr": "^2.0.0",
+        "fs-minipass": "^2.0.0",
+        "minipass": "^5.0.0",
+        "minizlib": "^2.1.1",
+        "mkdirp": "^1.0.3",
+        "yallist": "^4.0.0"
+      },
+      "engines": {
+        "node": ">=10"
+      }
+    },
+    "node_modules/tar-fs": {
+      "version": "2.1.4",
+      "resolved": "https://registry.npmjs.org/tar-fs/-/tar-fs-2.1.4.tgz",
+      "integrity": "sha512-mDAjwmZdh7LTT6pNleZ05Yt65HC3E+NiQzl672vQG38jIrehtJk/J3mNwIg+vShQPcLF/LV7CMnDW6vjj6sfYQ==",
+      "license": "MIT",
+      "dependencies": {
+        "chownr": "^1.1.1",
+        "mkdirp-classic": "^0.5.2",
+        "pump": "^3.0.0",
+        "tar-stream": "^2.1.4"
+      }
+    },
+    "node_modules/tar-fs/node_modules/chownr": {
+      "version": "1.1.4",
+      "resolved": "https://registry.npmjs.org/chownr/-/chownr-1.1.4.tgz",
+      "integrity": "sha512-jJ0bqzaylmJtVnNgzTeSOs8DPavpbYgEr/b0YL8/2GO3xJEhInFmhKMUnEJQjZumK7KXGFhUy89PrsJWlakBVg==",
+      "license": "ISC"
+    },
+    "node_modules/tar-stream": {
+      "version": "2.2.0",
+      "resolved": "https://registry.npmjs.org/tar-stream/-/tar-stream-2.2.0.tgz",
+      "integrity": "sha512-ujeqbceABgwMZxEJnk2HDY2DlnUZ+9oEcb1KzTVfYHio0UE6dG71n60d8D2I4qNvleWrrXpmjpt7vZeF1LnMZQ==",
+      "license": "MIT",
+      "dependencies": {
+        "bl": "^4.0.3",
+        "end-of-stream": "^1.4.1",
+        "fs-constants": "^1.0.0",
+        "inherits": "^2.0.3",
+        "readable-stream": "^3.1.1"
+      },
+      "engines": {
+        "node": ">=6"
+      }
+    },
+    "node_modules/tar/node_modules/minipass": {
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/minipass/-/minipass-5.0.0.tgz",
+      "integrity": "sha512-3FnjYuehv9k6ovOEbyOswadCDPX1piCfhV8ncmYtHOjuPwylVWsghTLo7rabjC3Rx5xD4HDx8Wm1xnMF7S5qFQ==",
+      "license": "ISC",
+      "engines": {
+        "node": ">=8"
+      }
+    },
     "node_modules/toidentifier": {
       "version": "1.0.1",
       "resolved": "https://registry.npmjs.org/toidentifier/-/toidentifier-1.0.1.tgz",
@@ -800,6 +2107,18 @@
         "node": ">=0.6"
       }
     },
+    "node_modules/tunnel-agent": {
+      "version": "0.6.0",
+      "resolved": "https://registry.npmjs.org/tunnel-agent/-/tunnel-agent-0.6.0.tgz",
+      "integrity": "sha512-McnNiV1l8RYeY8tBgEpuodCC1mLUdbSN+CYBL7kJsJNInOP8UjDDEwdk6Mw60vdLLrr5NHKZhMAOSrR2NZuQ+w==",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "safe-buffer": "^5.0.1"
+      },
+      "engines": {
+        "node": "*"
+      }
+    },
     "node_modules/type-is": {
       "version": "2.0.1",
       "resolved": "https://registry.npmjs.org/type-is/-/type-is-2.0.1.tgz",
@@ -814,6 +2133,26 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/unique-filename": {
+      "version": "1.1.1",
+      "resolved": "https://registry.npmjs.org/unique-filename/-/unique-filename-1.1.1.tgz",
+      "integrity": "sha512-Vmp0jIp2ln35UTXuryvjzkjGdRyf9b2lTXuSYUiPmzRcl3FDtYqAwOnTJkAngD9SWhnoJzDbTKwaOrZ+STtxNQ==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "unique-slug": "^2.0.0"
+      }
+    },
+    "node_modules/unique-slug": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/unique-slug/-/unique-slug-2.0.2.tgz",
+      "integrity": "sha512-zoWr9ObaxALD3DOPfjPSqxt4fnZiWblxHIgeWqW8x7UqDzEtHEQLzji2cuJYQFCU6KmoJikOYAZlrTHHebjx2w==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "imurmurhash": "^0.1.4"
+      }
+    },
     "node_modules/unpipe": {
       "version": "1.0.0",
       "resolved": "https://registry.npmjs.org/unpipe/-/unpipe-1.0.0.tgz",
@@ -823,6 +2162,25 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/util-deprecate": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/util-deprecate/-/util-deprecate-1.0.2.tgz",
+      "integrity": "sha512-EPD5q1uXyFxJpCrLnCc1nHnq3gOa6DZBocAIiI2TaSCA7VCJ1UJDMagCzIkXNsUYfD1daK//LTEQ8xiIbrHtcw==",
+      "license": "MIT"
+    },
+    "node_modules/uuid": {
+      "version": "13.0.0",
+      "resolved": "https://registry.npmjs.org/uuid/-/uuid-13.0.0.tgz",
+      "integrity": "sha512-XQegIaBTVUjSHliKqcnFqYypAd4S+WCYt5NIeRs6w/UAry7z8Y9j5ZwRRL4kzq9U3sD6v+85er9FvkEaBpji2w==",
+      "funding": [
+        "https://github.com/sponsors/broofa",
+        "https://github.com/sponsors/ctavan"
+      ],
+      "license": "MIT",
+      "bin": {
+        "uuid": "dist-node/bin/uuid"
+      }
+    },
     "node_modules/vary": {
       "version": "1.1.2",
       "resolved": "https://registry.npmjs.org/vary/-/vary-1.1.2.tgz",
@@ -832,11 +2190,43 @@
         "node": ">= 0.8"
       }
     },
+    "node_modules/which": {
+      "version": "2.0.2",
+      "resolved": "https://registry.npmjs.org/which/-/which-2.0.2.tgz",
+      "integrity": "sha512-BLI3Tl1TW3Pvl70l3yq3Y64i+awpwXqsGBYWkkqMtnbXgrMD+yj7rhW0kuEDxzJaYXGjEW5ogapKNMEKNMjibA==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "isexe": "^2.0.0"
+      },
+      "bin": {
+        "node-which": "bin/node-which"
+      },
+      "engines": {
+        "node": ">= 8"
+      }
+    },
+    "node_modules/wide-align": {
+      "version": "1.1.5",
+      "resolved": "https://registry.npmjs.org/wide-align/-/wide-align-1.1.5.tgz",
+      "integrity": "sha512-eDMORYaPNZ4sQIuuYPDHdQvf4gyCF9rEEV/yPxGfwPkRodwEgiMUUXTx/dex+Me0wxx53S+NgUHaP7y3MGlDmg==",
+      "license": "ISC",
+      "optional": true,
+      "dependencies": {
+        "string-width": "^1.0.2 || 2 || 3 || 4"
+      }
+    },
     "node_modules/wrappy": {
       "version": "1.0.2",
       "resolved": "https://registry.npmjs.org/wrappy/-/wrappy-1.0.2.tgz",
       "integrity": "sha512-l4Sp/DRseor9wL6EvV2+TuQn63dMkPjZ/sp9XkghTEbV9KlPS1xUsZ3u7/IQO4wxtcFB4bgpQPRcR3QCvezPcQ==",
       "license": "ISC"
+    },
+    "node_modules/yallist": {
+      "version": "4.0.0",
+      "resolved": "https://registry.npmjs.org/yallist/-/yallist-4.0.0.tgz",
+      "integrity": "sha512-3wdGidZyq5PB084XLES5TpOSRA3wjXAlIWMhum2kRcv/41Sn2emQ0dycQW4uZXLejwKvg6EsvbdlVL+FYEct7A==",
+      "license": "ISC"
     }
   }
 }
diff --git a/backend/package.json b/backend/package.json
index 0fa7f3c..8cdedc0 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -4,13 +4,16 @@
   "description": "Gym tracker application back-end",
   "license": "ISC",
   "author": "Roger Oriol",
-  "type": "commonjs",
+  "type": "module",
   "main": "server.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1",
     "start": "node server.js"
   },
   "dependencies": {
-    "express": "^5.1.0"
+    "cors": "^2.8.5",
+    "express": "^5.1.0",
+    "sqlite3": "^5.1.7",
+    "uuid": "^13.0.0"
   }
 }
diff --git a/backend/server.js b/backend/server.js
index e6a16da..8bd7b42 100644
--- a/backend/server.js
+++ b/backend/server.js
@@ -1,7 +1,7 @@
-const express = require('express');
-const cors = require('cors');
-const { v4: uuidv4 } = require('uuid');
-const db = require('./database');
+import express from 'express';
+import cors from 'cors';
+import { v4 as uuidv4 } from 'uuid';
+import * as db from './database.js';
 
 const app = express();
 const PORT = process.env.PORT || 3000;
diff --git a/data/gym-tracker.db b/data/gym-tracker.db
new file mode 100644
index 0000000000000000000000000000000000000000..1906df0501d5dad9aeef1ade84cb825d99ff4fbc
GIT binary patch
literal 12288
zcmeI$&rZTH90%}r5dV;n>B$pG-9=594kkEmPO^h>qT)y-#*hj{mjFY$C0=<IAHkRK
z6?_zrmc<=B;SrPXFKvG9er>XSZol2$_+c#AFq(~d%xtnnC?%(i5kfRIb82Qm)gqs5
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e00bZa0SG_<0uX=z1Rwx`e<rY(>umnzAHg?gvS!5q

literal 0
HcmV?d00001

diff --git a/frontend/api.js b/frontend/api.js
index e69de29..e4715ae 100644
--- a/frontend/api.js
+++ b/frontend/api.js
@@ -0,0 +1,145 @@
+// API client for backend communication
+
+const API_BASE_URL = 'http://localhost:3000/api';
+
+/**
+ * Fetch all gym sessions from the backend
+ * @returns {Promise<Array>} Array of session objects
+ */
+async function fetchSessions() {
+  try {
+    const response = await fetch(`${API_BASE_URL}/sessions`);
+
+    if (!response.ok) {
+      throw new Error(`Failed to fetch sessions: ${response.statusText}`);
+    }
+
+    const sessions = await response.json();
+    return sessions;
+  } catch (error) {
+    console.error('Error fetching sessions:', error);
+    throw error;
+  }
+}
+
+/**
+ * Create a new gym session
+ * @param {Object} session - Session object with date and muscle_groups
+ * @param {string} session.date - Date in ISO format (YYYY-MM-DD)
+ * @param {Array<string>} session.muscle_groups - Array of muscle group names
+ * @returns {Promise<Object>} Created session object
+ */
+async function createSession(session) {
+  try {
+    const response = await fetch(`${API_BASE_URL}/sessions`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(session),
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.error || `Failed to create session: ${response.statusText}`);
+    }
+
+    const createdSession = await response.json();
+    return createdSession;
+  } catch (error) {
+    console.error('Error creating session:', error);
+    throw error;
+  }
+}
+
+/**
+ * Update an existing gym session
+ * @param {string} id - Session ID
+ * @param {Object} session - Updated session object
+ * @param {string} session.date - Date in ISO format (YYYY-MM-DD)
+ * @param {Array<string>} session.muscle_groups - Array of muscle group names
+ * @returns {Promise<Object>} Updated session object
+ */
+async function updateSession(id, session) {
+  try {
+    const response = await fetch(`${API_BASE_URL}/sessions/${id}`, {
+      method: 'PUT',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(session),
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.error || `Failed to update session: ${response.statusText}`);
+    }
+
+    const updatedSession = await response.json();
+    return updatedSession;
+  } catch (error) {
+    console.error('Error updating session:', error);
+    throw error;
+  }
+}
+
+/**
+ * Delete a gym session
+ * @param {string} id - Session ID
+ * @returns {Promise<void>}
+ */
+async function deleteSession(id) {
+  try {
+    const response = await fetch(`${API_BASE_URL}/sessions/${id}`, {
+      method: 'DELETE',
+    });
+
+    if (!response.ok) {
+      const errorData = await response.json().catch(() => ({}));
+      throw new Error(errorData.error || `Failed to delete session: ${response.statusText}`);
+    }
+
+    return;
+  } catch (error) {
+    console.error('Error deleting session:', error);
+    throw error;
+  }
+}
+
+/**
+ * Show loading indicator
+ */
+function showLoading() {
+  const loadingIndicator = document.getElementById('loadingIndicator');
+  if (loadingIndicator) {
+    loadingIndicator.classList.add('active');
+  }
+}
+
+/**
+ * Hide loading indicator
+ */
+function hideLoading() {
+  const loadingIndicator = document.getElementById('loadingIndicator');
+  if (loadingIndicator) {
+    loadingIndicator.classList.remove('active');
+  }
+}
+
+/**
+ * Show error message to user
+ * @param {string} message - Error message to display
+ */
+function showError(message) {
+  alert(`Error: ${message}`);
+}
+
+/**
+ * Show success message to user
+ * @param {string} message - Success message to display
+ */
+function showSuccess(message) {
+  // For now, we'll use console.log
+  // In a production app, you might use a toast notification
+  console.log(`Success: ${message}`);
+}
diff --git a/frontend/app.js b/frontend/app.js
index e69de29..0445db2 100644
--- a/frontend/app.js
+++ b/frontend/app.js
@@ -0,0 +1,247 @@
+// Main Application Logic
+
+// Application state
+let sessions = [];
+let currentEditingSessionId = null;
+
+/**
+ * Initialize the application
+ */
+async function init() {
+    try {
+        showLoading();
+
+        // Load sessions from backend
+        await loadSessions();
+
+        // Set up event listeners
+        setupEventListeners();
+
+        // Initial render
+        updateUI();
+
+        hideLoading();
+    } catch (error) {
+        hideLoading();
+        showError('Failed to initialize application: ' + error.message);
+    }
+}
+
+/**
+ * Load all sessions from the backend
+ */
+async function loadSessions() {
+    try {
+        sessions = await fetchSessions();
+    } catch (error) {
+        console.error('Error loading sessions:', error);
+        throw error;
+    }
+}
+
+/**
+ * Set up all event listeners
+ */
+function setupEventListeners() {
+    // Add Workout button
+    const addWorkoutBtn = document.getElementById('addWorkoutBtn');
+    if (addWorkoutBtn) {
+        addWorkoutBtn.addEventListener('click', openAddSessionModal);
+    }
+
+    // Modal close button
+    const closeModalBtn = document.getElementById('closeModal');
+    if (closeModalBtn) {
+        closeModalBtn.addEventListener('click', closeModal);
+    }
+
+    // Cancel button
+    const cancelBtn = document.getElementById('cancelBtn');
+    if (cancelBtn) {
+        cancelBtn.addEventListener('click', closeModal);
+    }
+
+    // Session form submit
+    const sessionForm = document.getElementById('sessionForm');
+    if (sessionForm) {
+        sessionForm.addEventListener('submit', handleSessionFormSubmit);
+    }
+
+    // Close modal when clicking outside
+    const modal = document.getElementById('sessionModal');
+    if (modal) {
+        modal.addEventListener('click', (e) => {
+            if (e.target === modal) {
+                closeModal();
+            }
+        });
+    }
+}
+
+/**
+ * Open modal for adding a new session
+ */
+function openAddSessionModal() {
+    currentEditingSessionId = null;
+
+    const modalTitle = document.getElementById('modalTitle');
+    if (modalTitle) {
+        modalTitle.textContent = 'Add Workout Session';
+    }
+
+    // Set default date to today
+    const dateInput = document.getElementById('sessionDate');
+    if (dateInput) {
+        const today = new Date().toISOString().split('T')[0];
+        dateInput.value = today;
+    }
+
+    // Clear all checkboxes
+    const checkboxes = document.querySelectorAll('input[name="muscleGroup"]');
+    checkboxes.forEach(cb => cb.checked = false);
+
+    showModal();
+}
+
+/**
+ * Open modal for editing an existing session
+ * @param {string} sessionId - ID of the session to edit
+ */
+function openEditSessionModal(sessionId) {
+    const session = sessions.find(s => s.id === sessionId);
+    if (!session) {
+        showError('Session not found');
+        return;
+    }
+
+    currentEditingSessionId = sessionId;
+
+    const modalTitle = document.getElementById('modalTitle');
+    if (modalTitle) {
+        modalTitle.textContent = 'Edit Workout Session';
+    }
+
+    // Set date
+    const dateInput = document.getElementById('sessionDate');
+    if (dateInput) {
+        dateInput.value = session.date;
+    }
+
+    // Set checkboxes
+    const checkboxes = document.querySelectorAll('input[name="muscleGroup"]');
+    checkboxes.forEach(cb => {
+        cb.checked = session.muscle_groups.includes(cb.value);
+    });
+
+    showModal();
+}
+
+/**
+ * Show the modal
+ */
+function showModal() {
+    const modal = document.getElementById('sessionModal');
+    if (modal) {
+        modal.classList.add('active');
+    }
+}
+
+/**
+ * Close the modal
+ */
+function closeModal() {
+    const modal = document.getElementById('sessionModal');
+    if (modal) {
+        modal.classList.remove('active');
+    }
+    currentEditingSessionId = null;
+}
+
+/**
+ * Handle session form submission
+ * @param {Event} e - Form submit event
+ */
+async function handleSessionFormSubmit(e) {
+    e.preventDefault();
+
+    const dateInput = document.getElementById('sessionDate');
+    const checkboxes = document.querySelectorAll('input[name="muscleGroup"]:checked');
+
+    const date = dateInput.value;
+    const muscle_groups = Array.from(checkboxes).map(cb => cb.value);
+
+    // Validate that at least one muscle group is selected
+    if (muscle_groups.length === 0) {
+        showError('Please select at least one muscle group');
+        return;
+    }
+
+    const sessionData = {
+        date,
+        muscle_groups
+    };
+
+    try {
+        showLoading();
+
+        if (currentEditingSessionId) {
+            // Update existing session
+            await updateSession(currentEditingSessionId, sessionData);
+            showSuccess('Session updated successfully');
+        } else {
+            // Create new session
+            await createSession(sessionData);
+            showSuccess('Session added successfully');
+        }
+
+        // Reload sessions and update UI
+        await loadSessions();
+        updateUI();
+
+        closeModal();
+        hideLoading();
+    } catch (error) {
+        hideLoading();
+        showError('Failed to save session: ' + error.message);
+    }
+}
+
+/**
+ * Delete a session
+ * @param {string} sessionId - ID of the session to delete
+ */
+async function handleDeleteSession(sessionId) {
+    if (!confirm('Are you sure you want to delete this session?')) {
+        return;
+    }
+
+    try {
+        showLoading();
+        await deleteSession(sessionId);
+        await loadSessions();
+        updateUI();
+        hideLoading();
+        showSuccess('Session deleted successfully');
+    } catch (error) {
+        hideLoading();
+        showError('Failed to delete session: ' + error.message);
+    }
+}
+
+/**
+ * Update the entire UI with current sessions data
+ */
+function updateUI() {
+    // Update muscle groups dashboard
+    updateMuscleGroupsDashboard(sessions);
+
+    // Update heatmap
+    updateHeatmap(sessions);
+}
+
+// Initialize the application when DOM is ready
+if (document.readyState === 'loading') {
+    document.addEventListener('DOMContentLoaded', init);
+} else {
+    init();
+}
diff --git a/frontend/heatmap.js b/frontend/heatmap.js
new file mode 100644
index 0000000..b65d66c
--- /dev/null
+++ b/frontend/heatmap.js
@@ -0,0 +1,132 @@
+// Heatmap Component using Cal-Heatmap library
+
+let cal = null;
+
+/**
+ * Initialize the Cal-Heatmap component
+ * @param {Array} sessions - Array of session objects
+ */
+function initHeatmap(sessions) {
+  const container = document.getElementById('heatmap');
+  if (!container) return;
+
+  // Transform sessions data for Cal-Heatmap
+  const heatmapData = transformSessionsForHeatmap(sessions);
+
+  // Initialize Cal-Heatmap
+  cal = new CalHeatmap();
+
+  const currentYear = new Date().getFullYear();
+
+  cal.paint({
+    itemSelector: '#heatmap',
+    domain: {
+      type: 'month',
+      label: {
+        position: 'bottom'
+      },
+    },
+    subDomain: {
+      type: 'day'
+    },
+    data: {
+      source: heatmapData,
+      type: 'json',
+      x: 'date',
+      y: 'value'
+    },
+    date: {
+      start: new Date(currentYear, 0, 1),
+      max: new Date(currentYear, 11, 31)
+    },
+    range: 12,
+    scale: {
+      color: {
+        type: 'threshold',
+        range: ['#ebedf0', '#9be9a8', '#40c463', '#30a14e', '#216e39'],
+        domain: [1, 2, 3, 4]
+      }
+    },
+    itemName: ['workout', 'workouts'],
+    subDomainTextFormat: '%d',
+    tooltip: true
+  });
+
+  // Set up navigation controls
+  setupHeatmapControls();
+}
+
+/**
+ * Transform sessions array into format suitable for Cal-Heatmap
+ * @param {Array} sessions - Array of session objects
+ * @returns {Array} Transformed data for Cal-Heatmap
+ */
+function transformSessionsForHeatmap(sessions) {
+  const dateCounts = {};
+
+  sessions.forEach(session => {
+    const date = session.date;
+    // Count number of muscle groups trained (as measure of intensity)
+    const value = session.muscle_groups.length;
+
+    if (dateCounts[date]) {
+      dateCounts[date] += value;
+    } else {
+      dateCounts[date] = value;
+    }
+  });
+
+  // Convert to array format expected by Cal-Heatmap
+  return Object.entries(dateCounts).map(([date, value]) => ({
+    date,
+    value
+  }));
+}
+
+/**
+ * Update heatmap with new sessions data
+ * @param {Array} sessions - Array of session objects
+ */
+function updateHeatmap(sessions) {
+  if (!cal) {
+    initHeatmap(sessions);
+    return;
+  }
+
+  const heatmapData = transformSessionsForHeatmap(sessions);
+
+  // Update the heatmap data
+  cal.fill(heatmapData);
+}
+
+/**
+ * Set up navigation controls for the heatmap (previous/next)
+ */
+function setupHeatmapControls() {
+  const prevBtn = document.getElementById('heatmapPrev');
+  const nextBtn = document.getElementById('heatmapNext');
+
+  if (prevBtn && cal) {
+    prevBtn.addEventListener('click', () => {
+      cal.previous();
+    });
+  }
+
+  if (nextBtn && cal) {
+    nextBtn.addEventListener('click', () => {
+      cal.next();
+    });
+  }
+}
+
+/**
+ * Destroy and reinitialize the heatmap
+ * @param {Array} sessions - Array of session objects
+ */
+function reinitializeHeatmap(sessions) {
+  if (cal) {
+    cal.destroy();
+    cal = null;
+  }
+  initHeatmap(sessions);
+}
diff --git a/frontend/index.html b/frontend/index.html
index 1243fdf..873eeb3 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -2,55 +2,110 @@
 <html lang="en">
 
 <head>
-  <meta charset="utf-8">
-  <title>Gym tracker</title>
-  <base href="/">
-  <meta name="viewport"
-    content="viewport-fit=cover, width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=5.0">
-  <meta name="description" content="">
-  <meta name="keywords" content="">
-  <meta name="author" content="">
-  <meta name="application-name" content="">
-  <meta name="theme-color" content="#33d">
-  <meta name="color-scheme" content="light dark">
-  <meta property="og:title" content="" />
-  <meta property="og:type" content="website" />
-  <meta property="og:url" content="" />
-  <meta property="og:image" content="" />
-  <link rel="canonical" href="" />
-  <link rel="manifest" href="manifest.json">
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  <title>Gym Tracker</title>
+  <link rel="stylesheet" href="styles.css">
+  <link rel="stylesheet" href="https://unpkg.com/cal-heatmap/dist/cal-heatmap.css">
 
-  <link rel="preload"
-    href="https://fonts.googleapis.com/css2?family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&display=swap"
-    as="style" onload="this.onload=null;this.rel='stylesheet'">
-  <link rel="preconnect" href="https://fonts.gstatic.com">
-
-  <style>
-    body {
-      background: #fefefe;
-      color: #222;
-      font-family: 'Roboto', sans-serif;
-      padding: 1rem;
-      line-height: 1.8;
-    }
-  </style>
-  <link rel="preload" href="styles.css" as="style" onload="this.onload=null;this.rel='stylesheet'">
-  <noscript>
-    <link rel="stylesheet" href="styles.css">
-  </noscript>
-
-  <script>
-    if ('serviceWorker' in navigator) {
-      window.addEventListener('load', () => {
-        navigator.serviceWorker.register('/service-worker.js');
-      });
-    }
-  </script>
-
-  <script type="module" src="app.js"></script>
+  <script src="https://cdn.jsdelivr.net/npm/d3@7"></script>
+  <script src="https://unpkg.com/cal-heatmap@4.2.4/dist/cal-heatmap.min.js"></script>
+</head>
 
 <body>
+  <div class="container">
+    <!-- Header -->
+    <header class="header">
+      <h1>Gym Tracker</h1>
+      <div id="balanceIndicator" class="balance-indicator">
+        <span id="balanceEmoji" class="balance-emoji">😐</span>
+        <span id="balanceText" class="balance-text">Neutral Balance</span>
+      </div>
+    </header>
 
+    <!-- Add Workout Button -->
+    <div class="action-bar">
+      <button id="addWorkoutBtn" class="btn-primary">Add Today's Workout</button>
+    </div>
+
+    <!-- Heatmap Section -->
+    <section class="heatmap-section">
+      <h2>Training Calendar</h2>
+      <div class="heatmap-controls">
+        <button id="heatmapPrev" class="btn-secondary">← Previous</button>
+        <button id="heatmapNext" class="btn-secondary">Next →</button>
+      </div>
+      <div id="heatmap" class="heatmap-container"></div>
+    </section>
+
+    <!-- Muscle Groups Dashboard -->
+    <section class="muscle-groups-section">
+      <h2>Muscle Groups</h2>
+      <div id="muscleGroupsGrid" class="muscle-groups-grid">
+        <!-- Muscle group cards will be dynamically inserted here -->
+      </div>
+    </section>
+  </div>
+
+  <!-- Modal for Adding/Editing Session -->
+  <div id="sessionModal" class="modal">
+    <div class="modal-content">
+      <div class="modal-header">
+        <h3 id="modalTitle">Add Workout Session</h3>
+        <button id="closeModal" class="close-btn">&times;</button>
+      </div>
+      <form id="sessionForm">
+        <div class="form-group">
+          <label for="sessionDate">Date:</label>
+          <input type="date" id="sessionDate" name="date" required>
+        </div>
+        <div class="form-group">
+          <label>Muscle Groups Trained:</label>
+          <div class="checkbox-group">
+            <label class="checkbox-label">
+              <input type="checkbox" name="muscleGroup" value="Chest">
+              <span>Chest</span>
+            </label>
+            <label class="checkbox-label">
+              <input type="checkbox" name="muscleGroup" value="Legs">
+              <span>Legs</span>
+            </label>
+            <label class="checkbox-label">
+              <input type="checkbox" name="muscleGroup" value="Delts">
+              <span>Delts</span>
+            </label>
+            <label class="checkbox-label">
+              <input type="checkbox" name="muscleGroup" value="Lats">
+              <span>Lats</span>
+            </label>
+            <label class="checkbox-label">
+              <input type="checkbox" name="muscleGroup" value="Triceps">
+              <span>Triceps</span>
+            </label>
+            <label class="checkbox-label">
+              <input type="checkbox" name="muscleGroup" value="Biceps">
+              <span>Biceps</span>
+            </label>
+          </div>
+        </div>
+        <div class="form-actions">
+          <button type="button" id="cancelBtn" class="btn-secondary">Cancel</button>
+          <button type="submit" id="saveBtn" class="btn-primary">Save</button>
+        </div>
+      </form>
+    </div>
+  </div>
+
+  <!-- Loading Indicator -->
+  <div id="loadingIndicator" class="loading-indicator">
+    <div class="spinner"></div>
+  </div>
+
+  <!-- Application Scripts -->
+  <script src="api.js" defer></script>
+  <script src="muscleGroups.js" defer></script>
+  <script src="heatmap.js" defer></script>
+  <script src="app.js" defer></script>
 </body>
 
 </html>
diff --git a/frontend/muscleGroups.js b/frontend/muscleGroups.js
new file mode 100644
index 0000000..6acb2d6
--- /dev/null
+++ b/frontend/muscleGroups.js
@@ -0,0 +1,166 @@
+// Muscle Groups Dashboard Component
+
+// Configuration for the 6 muscle groups
+const MUSCLE_GROUPS = ['Chest', 'Legs', 'Delts', 'Lats', 'Triceps', 'Biceps'];
+
+/**
+ * Calculate statistics for each muscle group based on sessions
+ * @param {Array} sessions - Array of session objects
+ * @returns {Object} Statistics for each muscle group
+ */
+function calculateMuscleGroupStats(sessions) {
+  const now = new Date();
+  const sevenDaysAgo = new Date(now.getTime() - 7 * 24 * 60 * 60 * 1000);
+  const thirtyDaysAgo = new Date(now.getTime() - 30 * 24 * 60 * 60 * 1000);
+
+  const stats = {};
+
+  MUSCLE_GROUPS.forEach(muscle => {
+    // Filter sessions that include this muscle group
+    const muscleSessions = sessions.filter(session =>
+      session.muscle_groups.includes(muscle)
+    );
+
+    // Sort by date descending
+    const sortedSessions = muscleSessions
+      .map(s => ({ ...s, dateObj: new Date(s.date) }))
+      .sort((a, b) => b.dateObj - a.dateObj);
+
+    // Calculate days since last trained
+    let daysSince = null;
+    if (sortedSessions.length > 0) {
+      const lastDate = sortedSessions[0].dateObj;
+      const diffTime = now - lastDate;
+      daysSince = Math.floor(diffTime / (1000 * 60 * 60 * 24));
+    }
+
+    // Count sessions in last 7 days
+    const last7Days = sortedSessions.filter(s => s.dateObj >= sevenDaysAgo).length;
+
+    // Count sessions in last 30 days
+    const last30Days = sortedSessions.filter(s => s.dateObj >= thirtyDaysAgo).length;
+
+    // Determine status (good, warning, bad)
+    let status;
+    if (daysSince === null) {
+      status = 'bad'; // Never trained
+    } else if (daysSince <= 3) {
+      status = 'good';
+    } else if (daysSince <= 7) {
+      status = 'warning';
+    } else {
+      status = 'bad';
+    }
+
+    stats[muscle] = {
+      daysSince,
+      last7Days,
+      last30Days,
+      status
+    };
+  });
+
+  return stats;
+}
+
+/**
+ * Render muscle group cards in the dashboard
+ * @param {Object} stats - Statistics for each muscle group
+ */
+function renderMuscleGroups(stats) {
+  const container = document.getElementById('muscleGroupsGrid');
+  if (!container) return;
+
+  container.innerHTML = '';
+
+  MUSCLE_GROUPS.forEach(muscle => {
+    const muscleStats = stats[muscle];
+
+    const card = document.createElement('div');
+    card.className = `muscle-card status-${muscleStats.status}`;
+
+    const daysSinceText = muscleStats.daysSince === null
+      ? 'Never trained'
+      : muscleStats.daysSince === 0
+        ? 'Trained today'
+        : `${muscleStats.daysSince} day${muscleStats.daysSince === 1 ? '' : 's'} ago`;
+
+    card.innerHTML = `
+            <div class="muscle-card-header">
+                <h3 class="muscle-name">${muscle}</h3>
+                <div class="status-indicator ${muscleStats.status}"></div>
+            </div>
+            <div class="muscle-card-stats">
+                <div class="stat-row">
+                    <span class="stat-label">Last trained:</span>
+                    <span class="stat-value">${daysSinceText}</span>
+                </div>
+                <div class="stat-row">
+                    <span class="stat-label">Last 7 days:</span>
+                    <span class="stat-value">${muscleStats.last7Days}x</span>
+                </div>
+                <div class="stat-row">
+                    <span class="stat-label">Last 30 days:</span>
+                    <span class="stat-value">${muscleStats.last30Days}x</span>
+                </div>
+            </div>
+        `;
+
+    container.appendChild(card);
+  });
+}
+
+/**
+ * Calculate and update balance indicator
+ * @param {Object} stats - Statistics for each muscle group
+ */
+function updateBalanceIndicator(stats) {
+  const emojiElement = document.getElementById('balanceEmoji');
+  const textElement = document.getElementById('balanceText');
+
+  if (!emojiElement || !textElement) return;
+
+  // Check if all muscle groups meet certain criteria
+  const allTrainedLast7Days = MUSCLE_GROUPS.every(muscle =>
+    stats[muscle].last7Days >= 1
+  );
+
+  const allTrainedTwiceLast7Days = MUSCLE_GROUPS.every(muscle =>
+    stats[muscle].last7Days >= 2
+  );
+
+  let emoji, text, status;
+
+  if (allTrainedTwiceLast7Days) {
+    emoji = '=+';
+    text = 'Excellent Balance';
+    status = 'happy';
+  } else if (allTrainedLast7Days) {
+    emoji = '=';
+    text = 'Neutral Balance';
+    status = 'neutral';
+  } else {
+    emoji = '= ';
+    text = 'Poor Balance';
+    status = 'angry';
+  }
+
+  emojiElement.textContent = emoji;
+  textElement.textContent = text;
+
+  // Add status class for potential styling
+  const indicator = document.getElementById('balanceIndicator');
+  if (indicator) {
+    indicator.className = `balance-indicator balance-${status}`;
+  }
+}
+
+/**
+ * Update the entire muscle groups dashboard
+ * @param {Array} sessions - Array of session objects
+ */
+function updateMuscleGroupsDashboard(sessions) {
+  const stats = calculateMuscleGroupStats(sessions);
+  renderMuscleGroups(stats);
+  updateBalanceIndicator(stats);
+}
diff --git a/frontend/styles.css b/frontend/styles.css
index e69de29..dd47e9c 100644
--- a/frontend/styles.css
+++ b/frontend/styles.css
@@ -0,0 +1,411 @@
+/* Reset and Base Styles */
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
+    background: #f5f5f5;
+    color: #333;
+    line-height: 1.6;
+}
+
+.container {
+    max-width: 1200px;
+    margin: 0 auto;
+    padding: 20px;
+}
+
+/* Header */
+.header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 30px;
+    padding: 20px 0;
+    border-bottom: 2px solid #e0e0e0;
+}
+
+.header h1 {
+    font-size: 2rem;
+    font-weight: 700;
+    color: #2c3e50;
+}
+
+.balance-indicator {
+    display: flex;
+    align-items: center;
+    gap: 12px;
+    padding: 10px 20px;
+    background: white;
+    border-radius: 8px;
+    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
+}
+
+.balance-emoji {
+    font-size: 2rem;
+}
+
+.balance-text {
+    font-size: 1rem;
+    font-weight: 500;
+    color: #555;
+}
+
+/* Action Bar */
+.action-bar {
+    margin-bottom: 30px;
+    text-align: center;
+}
+
+/* Buttons */
+.btn-primary {
+    background: #4CAF50;
+    color: white;
+    border: none;
+    padding: 12px 24px;
+    font-size: 1rem;
+    font-weight: 500;
+    border-radius: 6px;
+    cursor: pointer;
+    transition: background 0.3s ease;
+}
+
+.btn-primary:hover {
+    background: #45a049;
+}
+
+.btn-secondary {
+    background: #6c757d;
+    color: white;
+    border: none;
+    padding: 8px 16px;
+    font-size: 0.9rem;
+    font-weight: 500;
+    border-radius: 6px;
+    cursor: pointer;
+    transition: background 0.3s ease;
+}
+
+.btn-secondary:hover {
+    background: #5a6268;
+}
+
+/* Heatmap Section */
+.heatmap-section {
+    background: white;
+    padding: 30px;
+    margin-bottom: 30px;
+    border-radius: 8px;
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+
+.heatmap-section h2 {
+    font-size: 1.5rem;
+    margin-bottom: 20px;
+    color: #2c3e50;
+}
+
+.heatmap-controls {
+    display: flex;
+    gap: 10px;
+    margin-bottom: 20px;
+}
+
+.heatmap-container {
+    overflow-x: auto;
+}
+
+/* Muscle Groups Section */
+.muscle-groups-section {
+    background: white;
+    padding: 30px;
+    border-radius: 8px;
+    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
+}
+
+.muscle-groups-section h2 {
+    font-size: 1.5rem;
+    margin-bottom: 20px;
+    color: #2c3e50;
+}
+
+.muscle-groups-grid {
+    display: grid;
+    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
+    gap: 20px;
+}
+
+/* Muscle Group Card */
+.muscle-card {
+    background: #f9f9f9;
+    padding: 20px;
+    border-radius: 8px;
+    border-left: 4px solid #ccc;
+    transition: transform 0.2s ease, box-shadow 0.2s ease;
+}
+
+.muscle-card:hover {
+    transform: translateY(-2px);
+    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
+}
+
+.muscle-card.status-good {
+    border-left-color: #4CAF50;
+}
+
+.muscle-card.status-warning {
+    border-left-color: #FFC107;
+}
+
+.muscle-card.status-bad {
+    border-left-color: #F44336;
+}
+
+.muscle-card-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    margin-bottom: 15px;
+}
+
+.muscle-name {
+    font-size: 1.2rem;
+    font-weight: 600;
+    color: #2c3e50;
+}
+
+.status-indicator {
+    width: 12px;
+    height: 12px;
+    border-radius: 50%;
+}
+
+.status-indicator.good {
+    background: #4CAF50;
+}
+
+.status-indicator.warning {
+    background: #FFC107;
+}
+
+.status-indicator.bad {
+    background: #F44336;
+}
+
+.muscle-card-stats {
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+}
+
+.stat-row {
+    display: flex;
+    justify-content: space-between;
+    font-size: 0.9rem;
+}
+
+.stat-label {
+    color: #666;
+}
+
+.stat-value {
+    font-weight: 600;
+    color: #333;
+}
+
+/* Modal */
+.modal {
+    display: none;
+    position: fixed;
+    z-index: 1000;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    overflow: auto;
+    background-color: rgba(0, 0, 0, 0.5);
+}
+
+.modal.active {
+    display: flex;
+    justify-content: center;
+    align-items: center;
+}
+
+.modal-content {
+    background: white;
+    padding: 0;
+    border-radius: 8px;
+    width: 90%;
+    max-width: 500px;
+    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
+}
+
+.modal-header {
+    display: flex;
+    justify-content: space-between;
+    align-items: center;
+    padding: 20px;
+    border-bottom: 1px solid #e0e0e0;
+}
+
+.modal-header h3 {
+    font-size: 1.3rem;
+    color: #2c3e50;
+}
+
+.close-btn {
+    background: none;
+    border: none;
+    font-size: 1.8rem;
+    color: #999;
+    cursor: pointer;
+    line-height: 1;
+}
+
+.close-btn:hover {
+    color: #333;
+}
+
+/* Form */
+#sessionForm {
+    padding: 20px;
+}
+
+.form-group {
+    margin-bottom: 20px;
+}
+
+.form-group label {
+    display: block;
+    margin-bottom: 8px;
+    font-weight: 500;
+    color: #555;
+}
+
+.form-group input[type="date"] {
+    width: 100%;
+    padding: 10px;
+    border: 1px solid #ddd;
+    border-radius: 4px;
+    font-size: 1rem;
+}
+
+.checkbox-group {
+    display: grid;
+    grid-template-columns: repeat(2, 1fr);
+    gap: 12px;
+}
+
+.checkbox-label {
+    display: flex;
+    align-items: center;
+    gap: 8px;
+    padding: 10px;
+    background: #f5f5f5;
+    border-radius: 4px;
+    cursor: pointer;
+    transition: background 0.2s ease;
+}
+
+.checkbox-label:hover {
+    background: #e8e8e8;
+}
+
+.checkbox-label input[type="checkbox"] {
+    width: 18px;
+    height: 18px;
+    cursor: pointer;
+}
+
+.checkbox-label span {
+    font-size: 0.95rem;
+    color: #333;
+}
+
+.form-actions {
+    display: flex;
+    justify-content: flex-end;
+    gap: 10px;
+    margin-top: 24px;
+}
+
+/* Loading Indicator */
+.loading-indicator {
+    display: none;
+    position: fixed;
+    z-index: 2000;
+    left: 0;
+    top: 0;
+    width: 100%;
+    height: 100%;
+    background-color: rgba(0, 0, 0, 0.3);
+    justify-content: center;
+    align-items: center;
+}
+
+.loading-indicator.active {
+    display: flex;
+}
+
+.spinner {
+    border: 4px solid #f3f3f3;
+    border-top: 4px solid #4CAF50;
+    border-radius: 50%;
+    width: 50px;
+    height: 50px;
+    animation: spin 1s linear infinite;
+}
+
+@keyframes spin {
+    0% { transform: rotate(0deg); }
+    100% { transform: rotate(360deg); }
+}
+
+/* Responsive Design */
+@media (max-width: 768px) {
+    .container {
+        padding: 10px;
+    }
+
+    .header {
+        flex-direction: column;
+        gap: 15px;
+        text-align: center;
+    }
+
+    .header h1 {
+        font-size: 1.5rem;
+    }
+
+    .muscle-groups-grid {
+        grid-template-columns: 1fr;
+    }
+
+    .checkbox-group {
+        grid-template-columns: 1fr;
+    }
+
+    .heatmap-section,
+    .muscle-groups-section {
+        padding: 15px;
+    }
+}
+
+/* Cal-Heatmap Overrides */
+.cal-heatmap-container {
+    font-family: inherit;
+}
+
+.cal-heatmap-container .graph-label {
+    fill: #666;
+    font-size: 12px;
+}
+
+.cal-heatmap-container rect.highlight {
+    stroke: #4CAF50;
+    stroke-width: 2;
+}
diff --git a/kubernetes/README.md b/kubernetes/README.md
new file mode 100644
index 0000000..e8c8d16
--- /dev/null
+++ b/kubernetes/README.md
@@ -0,0 +1,158 @@
+# Kubernetes Deployment
+
+This directory contains Kubernetes manifests for deploying the Gym Tracker application.
+
+## Prerequisites
+
+- Kubernetes cluster (1.19+)
+- kubectl configured to access your cluster
+- Docker registry (optional, for remote deployments)
+
+## Files
+
+- **persistentvolumeclaim.yaml** - PVC for SQLite database storage
+- **deployment.yaml** - Application deployment
+- **service.yaml** - ClusterIP service for internal access
+- **ingress.yaml** - Optional ingress for external access
+
+## Deployment Steps
+
+### 1. Build and Push Docker Image
+
+Build the Docker image:
+```bash
+docker build -t gym-tracker:latest .
+```
+
+If deploying to a remote cluster, tag and push to your registry:
+```bash
+docker tag gym-tracker:latest your-registry/gym-tracker:latest
+docker push your-registry/gym-tracker:latest
+```
+
+Update the image name in `deployment.yaml` accordingly.
+
+### 2. Deploy to Kubernetes
+
+Apply all manifests:
+```bash
+kubectl apply -f kubernetes/
+```
+
+Or apply individually in order:
+```bash
+kubectl apply -f kubernetes/persistentvolumeclaim.yaml
+kubectl apply -f kubernetes/deployment.yaml
+kubectl apply -f kubernetes/service.yaml
+# Optional: kubectl apply -f kubernetes/ingress.yaml
+```
+
+### 3. Verify Deployment
+
+Check the deployment status:
+```bash
+kubectl get pods -l app=gym-tracker
+kubectl get svc gym-tracker
+kubectl get pvc gym-tracker-data
+```
+
+View logs:
+```bash
+kubectl logs -l app=gym-tracker -f
+```
+
+### 4. Access the Application
+
+#### Port Forward (for testing)
+```bash
+kubectl port-forward svc/gym-tracker 8080:80
+```
+Then access at http://localhost:8080
+
+#### Using Ingress (for production)
+1. Ensure an Ingress controller is installed in your cluster
+2. Update the host in `ingress.yaml` with your domain
+3. Apply the ingress: `kubectl apply -f kubernetes/ingress.yaml`
+4. Access at http://your-domain.com
+
+#### Using LoadBalancer
+Change the service type in `service.yaml` from `ClusterIP` to `LoadBalancer`:
+```yaml
+spec:
+  type: LoadBalancer
+```
+Then get the external IP:
+```bash
+kubectl get svc gym-tracker
+```
+
+## Configuration
+
+### Storage
+
+The default PVC requests 1Gi of storage. Adjust in `persistentvolumeclaim.yaml`:
+```yaml
+resources:
+  requests:
+    storage: 5Gi  # Increase as needed
+```
+
+### Replicas
+
+The application uses SQLite, which is file-based. Keep replicas at 1 to avoid database locking issues:
+```yaml
+spec:
+  replicas: 1
+```
+
+For high availability, consider migrating to PostgreSQL or MySQL.
+
+### Resources
+
+Adjust resource limits in `deployment.yaml` based on your needs:
+```yaml
+resources:
+  requests:
+    memory: "256Mi"
+    cpu: "200m"
+  limits:
+    memory: "1Gi"
+    cpu: "1000m"
+```
+
+## Backup
+
+To backup the SQLite database:
+```bash
+kubectl exec -it <pod-name> -- sqlite3 /app/data/gym-tracker.db ".backup /app/data/backup.db"
+kubectl cp <pod-name>:/app/data/backup.db ./backup.db
+```
+
+## Troubleshooting
+
+### Pod not starting
+```bash
+kubectl describe pod -l app=gym-tracker
+kubectl logs -l app=gym-tracker
+```
+
+### Database issues
+Check volume mount:
+```bash
+kubectl exec -it <pod-name> -- ls -la /app/data
+```
+
+### Health check failures
+Test health endpoint:
+```bash
+kubectl exec -it <pod-name> -- wget -O- http://localhost/health
+```
+
+## Cleanup
+
+Remove all resources:
+```bash
+kubectl delete -f kubernetes/
+```
+
+**Warning:** This will delete the PVC and all data. Backup first if needed.
diff --git a/kubernetes/deployment.yaml b/kubernetes/deployment.yaml
new file mode 100644
index 0000000..f428f0d
--- /dev/null
+++ b/kubernetes/deployment.yaml
@@ -0,0 +1,62 @@
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: gym-tracker
+  labels:
+    app: gym-tracker
+spec:
+  replicas: 1  # Single replica since we're using SQLite with file-based storage
+  selector:
+    matchLabels:
+      app: gym-tracker
+  template:
+    metadata:
+      labels:
+        app: gym-tracker
+    spec:
+      containers:
+      - name: gym-tracker
+        image: gym-tracker:latest  # Update with your registry/image name
+        imagePullPolicy: IfNotPresent
+        ports:
+        - name: http
+          containerPort: 80
+          protocol: TCP
+        - name: api
+          containerPort: 3000
+          protocol: TCP
+        env:
+        - name: NODE_ENV
+          value: "production"
+        - name: PORT
+          value: "3000"
+        volumeMounts:
+        - name: data
+          mountPath: /app/data
+        livenessProbe:
+          httpGet:
+            path: /health
+            port: 80
+          initialDelaySeconds: 15
+          periodSeconds: 30
+          timeoutSeconds: 5
+          failureThreshold: 3
+        readinessProbe:
+          httpGet:
+            path: /health
+            port: 80
+          initialDelaySeconds: 5
+          periodSeconds: 10
+          timeoutSeconds: 3
+          failureThreshold: 3
+        resources:
+          requests:
+            memory: "128Mi"
+            cpu: "100m"
+          limits:
+            memory: "512Mi"
+            cpu: "500m"
+      volumes:
+      - name: data
+        persistentVolumeClaim:
+          claimName: gym-tracker-data
diff --git a/kubernetes/ingress.yaml b/kubernetes/ingress.yaml
new file mode 100644
index 0000000..d8c9f07
--- /dev/null
+++ b/kubernetes/ingress.yaml
@@ -0,0 +1,30 @@
+# Optional: Ingress for external access
+# Requires an Ingress controller (e.g., nginx-ingress, traefik) installed in your cluster
+apiVersion: networking.k8s.io/v1
+kind: Ingress
+metadata:
+  name: gym-tracker
+  labels:
+    app: gym-tracker
+  annotations:
+    # Uncomment and adjust based on your ingress controller
+    # nginx.ingress.kubernetes.io/rewrite-target: /
+    # cert-manager.io/cluster-issuer: letsencrypt-prod  # For HTTPS with cert-manager
+spec:
+  ingressClassName: nginx  # Adjust based on your ingress controller
+  rules:
+  - host: gym-tracker.example.com  # Update with your domain
+    http:
+      paths:
+      - path: /
+        pathType: Prefix
+        backend:
+          service:
+            name: gym-tracker
+            port:
+              number: 80
+  # Uncomment for HTTPS
+  # tls:
+  # - hosts:
+  #   - gym-tracker.example.com
+  #   secretName: gym-tracker-tls
diff --git a/kubernetes/persistentvolumeclaim.yaml b/kubernetes/persistentvolumeclaim.yaml
new file mode 100644
index 0000000..917abfe
--- /dev/null
+++ b/kubernetes/persistentvolumeclaim.yaml
@@ -0,0 +1,13 @@
+apiVersion: v1
+kind: PersistentVolumeClaim
+metadata:
+  name: gym-tracker-data
+  labels:
+    app: gym-tracker
+spec:
+  accessModes:
+    - ReadWriteOnce  # Single node access for SQLite
+  resources:
+    requests:
+      storage: 1Gi  # Adjust size as needed
+  # storageClassName: standard  # Uncomment and adjust based on your cluster's storage classes
diff --git a/kubernetes/service.yaml b/kubernetes/service.yaml
new file mode 100644
index 0000000..6ae10c7
--- /dev/null
+++ b/kubernetes/service.yaml
@@ -0,0 +1,15 @@
+apiVersion: v1
+kind: Service
+metadata:
+  name: gym-tracker
+  labels:
+    app: gym-tracker
+spec:
+  type: ClusterIP  # Change to LoadBalancer or NodePort if external access is needed
+  ports:
+  - port: 80
+    targetPort: 80
+    protocol: TCP
+    name: http
+  selector:
+    app: gym-tracker
diff --git a/nginx/nginx.conf b/nginx/nginx.conf
index e69de29..4e508c7 100644
--- a/nginx/nginx.conf
+++ b/nginx/nginx.conf
@@ -0,0 +1,80 @@
+events {
+    worker_connections 1024;
+}
+
+http {
+    include       /etc/nginx/mime.types;
+    default_type  application/octet-stream;
+
+    # Logging
+    access_log /var/log/nginx/access.log;
+    error_log /var/log/nginx/error.log;
+
+    # Performance
+    sendfile on;
+    tcp_nopush on;
+    tcp_nodelay on;
+    keepalive_timeout 65;
+    types_hash_max_size 2048;
+
+    # Gzip compression
+    gzip on;
+    gzip_vary on;
+    gzip_min_length 1024;
+    gzip_types text/plain text/css text/xml text/javascript application/javascript application/json application/xml+rss;
+
+    server {
+        listen 80;
+        server_name localhost;
+
+        # Root directory for static files
+        root /usr/share/nginx/html;
+        index index.html;
+
+        # Serve static frontend files
+        location / {
+            try_files $uri $uri/ /index.html;
+
+            # Cache control for static assets
+            location ~* \.(js|css|png|jpg|jpeg|gif|ico|svg|woff|woff2|ttf|eot)$ {
+                expires 1y;
+                add_header Cache-Control "public, immutable";
+            }
+        }
+
+        # Proxy API requests to backend
+        location /api/ {
+            proxy_pass http://localhost:3000;
+            proxy_http_version 1.1;
+
+            # Headers
+            proxy_set_header Host $host;
+            proxy_set_header X-Real-IP $remote_addr;
+            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
+            proxy_set_header X-Forwarded-Proto $scheme;
+
+            # Timeouts
+            proxy_connect_timeout 60s;
+            proxy_send_timeout 60s;
+            proxy_read_timeout 60s;
+
+            # Disable buffering for real-time responses
+            proxy_buffering off;
+        }
+
+        # Health check endpoint (proxy to backend)
+        location /health {
+            proxy_pass http://localhost:3000/health;
+            proxy_http_version 1.1;
+            proxy_set_header Host $host;
+            access_log off;
+        }
+
+        # Error pages
+        error_page 404 /index.html;
+        error_page 500 502 503 504 /50x.html;
+        location = /50x.html {
+            root /usr/share/nginx/html;
+        }
+    }
+}