I need a mobile app that lets users treat their phone as a personal fitness companion. The focus is strictly on Fitness and Exercise, so every screen should make logging a workout simple, visualising progress rewarding, and sharing achievements effortless. The same codebase must compile cleanly for both iOS and Android. Whether you prefer Flutter, React Native, Kotlin Multiplatform or another modern toolkit is up to you, as long as the final binaries pass App Store and Google Play review. Core experience • Workout tracking – users choose or create routines, record sets, reps and weights in as few taps as possible. • Progress tracking – charts, streaks, PB badges and other data-driven insights to keep people engaged. • Social sharing – a lightweight feed or integration that lets friends cheer each other on without turning the app into full-blown social media. Deliverables - Production-ready iOS and Android apps uploaded to TestFlight / internal testing track. - Source code with clear README and build instructions. - UI/UX assets (Figma/Sketch) and exported graphics. - One short hand-off call or screen-share demo so I can walk through deployment. Clean architecture, modular code and basic unit tests are expected so future features—nutrition, sleep or additional wearables—can slot in without rewrites. Let me know which framework you propose, a ballpark timeline and any previous fitness-related apps you can show.