React Native fitness app with OpenAI-powered programme generation, exercise video library, workout logging with progressive overload tracking, and social sharing. Currently in private beta with 120 testers.
The client — a certified personal trainer — wanted to scale beyond 1:1 coaching without losing the personalisation that makes their programmes effective. Generic fitness apps felt impersonal; hiring engineers to build a full custom app was out of budget.
Built in React Native with Expo for cross-platform coverage from day one. An OpenAI GPT-4 integration generates personalised programmes based on user fitness level, goals, available equipment, and time constraints — all prompted with the trainer's coaching methodology embedded in the system prompt. Progressive overload is tracked automatically and reflected in the AI's next programme generation.
Currently in private beta with 120 users, averaging 4.8★ internal satisfaction rating. Beta users log an average of 4.2 workouts per week (vs. industry avg of 2.1). Full App Store / Play Store launch planned for Q2 2025.
