FitFlow: Workout Planning App
Cross-platform mobile fitness application for creating custom workout routines, tracking progress, and following video-guided exercises with complete offline support.
Project Overview
FitFlow is a mobile-first fitness application that simplifies workout planning and tracking. Users can create custom routines, follow pre-built programs, track sets/reps/weight, view exercise demonstrations, and monitor progress over time.
Built with React Native for true cross-platform support on iOS and Android, featuring an offline-first architecture that works perfectly even without an internet connection.
Core Features
Custom Workouts
Build personalized routines with 200+ exercises. Organize by muscle groups or training split. Save and reuse favorite combinations.
Progress Tracking
Log sets, reps, weight, and rest time. Track personal records and visualize strength gains with detailed history views.
Exercise Library
200+ exercises with video demonstrations and detailed instructions. Search and filter by equipment, difficulty, and muscle group.
Workout Timer
Built-in rest timer with customizable intervals and audio cues. Background timer works when app is minimized.
Progress Analytics
Charts showing strength progression over time. Body measurements tracking including weight and body fat percentage with achievement badges.
Offline Support
Full offline functionality with no internet required. Syncs data when connection restored. Download exercise videos for offline viewing.
Technical Implementation
Built with React Native for cross-platform mobile development:
Mobile Framework
React Native with Expo, TypeScript for type safety, React Navigation for routing, Reanimated for smooth animations, and haptic feedback.
State & Data
Zustand for state management, Supabase backend, SQLite for offline storage, AsyncStorage for preferences, and offline-first architecture.
User Experience
Video playback with controls, background timers, push notifications, dark/light themes, haptic feedback, and workout screenshot sharing.
Deployment
Published on App Store (iOS) and Google Play Store (Android). EAS Build for native builds, OTA updates via Expo, and analytics with Amplitude.
Results & Impact
User Engagement
200 daily active users with 70% retention after first week. Users average 4 workouts per week with 5000+ total workouts logged across the platform.
App Store Success
500+ downloads in first month organically. 4.7 star rating on App Store. Featured in "New Apps We Love" on iOS with positive reviews.
Technical Achievement
True offline-first app with seamless sync. 60fps animations throughout. App size under 50MB with battery-efficient background timers.
User Feedback
Users praise the offline functionality and smooth performance. Many report improved consistency in their fitness routines thanks to easy workout tracking.