Build a Fitness App in 21 Days
Workout plans, progress tracking, video workouts, and in-app subscriptions — fixed price.
Why Fitness & Workout App development is hard to get right
Video streaming for workout content requires proper infrastructure — not just uploading to S3
In-app subscriptions on iOS and Android have complex receipt validation — easy to get wrong
Health data integration (Apple Health, Google Fit) requires specific entitlements and privacy handling
Workout tracking with real-time feedback (rep counting, timer) needs careful mobile UX design
What we build — in detail
Workout library & plans
Categorized exercises with video demos. Custom plan builder — days/weeks, sets/reps, rest periods. Progressive overload tracking.
Video workout player
Mux-powered adaptive streaming — HD quality that adjusts to connection speed. Landscape mode, custom player controls, AirPlay/Chromecast support.
Progress tracking
Weight logs, PR tracker, body measurements, progress photos. Charts for every metric over time.
In-app subscriptions
RevenueCat handles iOS and Android subscriptions, free trials, and paywall logic. Monthly and annual plans with upgrade/downgrade.
Apple Health & Google Fit sync
Workout duration, calories burned, heart rate — synced bidirectionally with native health platforms.
Coach / trainer dashboard
For trainer-led apps: client management, custom plan assignment, progress monitoring, in-app messaging.
Push notifications & reminders
Scheduled workout reminders, streak alerts, motivational messages. Personalized based on user's plan schedule.
Tech Stack
- →React Native + Expo
- →Supabase (Postgres + Auth)
- →Mux (video streaming)
- →RevenueCat (subscriptions)
- →HealthKit / Google Fit
- →Expo Push
What you get
- iOS app (App Store ready)
- Android app (Play Store ready)
- Coach dashboard (web)
- Full source code
- RevenueCat subscription setup
Frequently asked questions
How do you handle video content?
We use Mux — the same video infrastructure used by Peloton and Mirror. Videos are transcoded automatically to multiple qualities, streamed adaptively, and cached at CDN edge. No buffering, no quality issues.
How do in-app subscriptions work on iOS and Android?
RevenueCat abstracts the complexity of StoreKit (iOS) and Google Play Billing (Android) into a single API. It handles receipt validation, trial periods, and subscription analytics. We configure this as part of every fitness app build.
Can you build a Peloton / Mirror-style connected fitness app?
We can build the software side — app, content management, subscription billing. Hardware integration requires separate hardware engineering. For software-only fitness platforms, we're a strong fit.
Free Fitness & Workout App resources
Download these before you start — no credit card, just your email.
Ready to build your fitness & workout app?
Book a free 30-minute scoping call. We'll map out exactly what v1 looks like, give you a fixed price, and start within a week.
Book a Free Scoping Call →Free · No commitment · Delivered in 3–4 weeks