Add .NET MAUI Android personal fitness tracker app with Gemini AI integration

[Copilot]

Implements the FitnessTracker app from scratch — a personal trainer/assistant built with .NET MAUI targeting Android, with Google Gemini AI, Strava import, and progressive overload workout programming.

Project Structure

FitnessTracker/
├── Models/          # Workout, Exercise, Activity, UserProfile, ChatMessage, EquipmentType
├── Services/        # DatabaseService, GeminiService, StravaService, ProgressiveOverloadService
├── ViewModels/      # 11 ViewModels using CommunityToolkit.Mvvm (MVVM pattern)
├── Views/           # 11 XAML pages (Shell tab navigation)
└── Converters/      # ActivityTypeToIcon, EquipmentTypeToIcon, MessageRole*, etc.

Key Features

• Workout tracking — log exercises with sets/reps/weight; mark complete; save as reusable templates
• Equipment type — per-exercise EquipmentType enum: Barbell, Dumbbell, Kettlebell, CableMachine, Bodyweight, etc.
• Progressive overload — ProgressiveOverloadService auto-increments reps until threshold then bumps weight by 2.5kg; AI path via Gemini returns structured JSON suggestion
• Google Gemini (Mscc.GenerativeAI) — chat assistant, AI workout suggestions (JSON-mode), per-exercise form/technique advice; API key stored in user profile
• Activity tracking — manual entry (running, swimming, cycling, etc.) with distance, duration, HR, elevation; Strava OAuth import via REST
• Exercise library — 30+ seeded exercises across all muscle groups; form image URL field; AI form tips on demand
• Progress dashboard — active streak calculation, 8-week weekly bar chart, aggregate distance/calories

Stack

Concern	Library
UI	.NET MAUI net10.0-android, Shell + TabBar
MVVM	CommunityToolkit.Mvvm 8.4.0
Persistence	sqlite-net-pcl 1.9.172 (SQLite)
AI	Mscc.GenerativeAI 3.1.0
DI	MAUI built-in Microsoft.Extensions.DependencyInjection

Notes

• GeminiService uses a using AppChatMessage = FitnessTracker.Models.ChatMessage alias to resolve ambiguity with Mscc.GenerativeAI.Types.ChatMessage
• Strava token refresh is stored back to UserProfile in SQLite; OAuth flow opens system browser to the Strava authorize URL
• ProgressiveOverloadService is the offline fallback when no Gemini API key is configured

Original prompt

This app will be my personal trainer/assistant in my fitness journey.

I need it to track workouts, suggest new workouts using a progressive overload strategy, track other activities like running and swimming where I feed in the stats either manually or imported from other external applications/services like strava for example.

I need it to integrate with google Gemini.

It will be a mobile app developed in C# with MAUI and must support running on android, ios may be added at a later date.

I want to be able to specify if I am using free weights or cable machines.

Ideally an image showing the correct form for the exercise as well.

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