01
Only dumbbells
Problem
General apps bury dumbbell work among machines and barbells.
How we solved it
The entire library is built around dumbbells, each move with a level, coaching tips and video.
Case study · 12Fitness
iXRCISE: Dumbbell Workouts
A dumbbell-only training app with 70+ coached moves, ready plans and a workout builder, in English and French.
- Client
- Ixrcise
- Industry
- Health & Fitness · Consumer Mobile
- Platform
- iOS · Android
- Timeline
- 16 weeks
- Outcome
- 70+ coached dumbbell moves, ready plans and custom routines
- 70+Guided dumbbell exercises
- 3Difficulty levels
- 2Languages: English and French
01
Overview
iXRCISE is for people whose main equipment is a pair of dumbbells. It offers over 70 exercises with video coaching, plans to follow, a builder for custom routines and timed sessions that handle reps and rest. We delivered the iPhone and Android app with a premium subscription.
02
The challenge
Most fitness apps assume a full gym, and most programs assume you'll follow them exactly. People training with dumbbells at home were left assembling routines from scattered videos, unsure of their form. iXRCISE wanted structure that still lets people train their own way.
03
Our approach
We made the session the core of the product. Every exercise, plan and custom routine ends up as a guided workout with timing, rest and a clear finish.
04
How we built it
4 steps, from architecture to launch.
- 01
Exercise content as data
Each move stores its video, level, tips and default sets, reps and rest, which plans and the builder both reuse.
- 02
Session engine
Video playback, a work timer and rest countdowns run the active workout, with a summary at the end.
- 03
Premium and accounts
RevenueCat handles monthly, yearly and lifetime purchases, verified against Firebase accounts.
- 04
Two languages
The interface switches between English and French at runtime from the profile.
05
Problem → How we solved itTechnical challenges
02
Plans and freedom together
Problem
Fixed programs don't suit everyone, but a blank page doesn't either.
How we solved it
Ready-made plans sit alongside a builder where users set exercises, reps, weight, rest and schedule.
03
From a video list to a workout
Problem
Watching videos isn't the same as training.
How we solved it
A guided session player times each set, counts down rest and closes with a summary.
06
5 screensScreens
07
5 featuresWhat we shipped
- 01
Exercise library
70+ dumbbell moves with video, difficulty, tips and recommended volume.
- 02
Plans and builder
Follow a ready plan or design your own routine with sets, reps, weight and rest.
- 03
Guided sessions
Timers, rest countdowns and video, ending with a workout summary.
- 04
Your level
Pick easy, medium or hard and get a tutorial on first launch.
- 05
Premium, two languages
Monthly, yearly or lifetime premium, in English or French.
08
Tech stack
- Flutter
- iOS and Android workout app
- Firebase
- Accounts and synced workout data
- RevenueCat
- Subscriptions and lifetime purchase
- BLoC + Provider
- State management
- Video Player
- Exercise video playback
- Flutter Localizations
- Runtime language switching
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