GermanyCountryBreakletics had an audience and a first app that once hit 100,000 downloads, then aged out of the stores. We rebuilt HIIT the Beat on FlutterFlow in 7–8 weeks of active development: the flow users already knew, a 10,000-video library, subscriptions and an admin panel, launched without a single crash.
What we did
Tasks
Team
Challenge
The old app was so brittle that fixing one screen broke another. Reviving it wasn't realistic, and a months-long rebuild wasn't an option either.
Solution
A clean rebuild on FlutterFlow: seasons of workouts by level, warm-ups and cool-downs, points, subscriptions via RevenueCat and a desktop admin panel for content.
Result
Released three months after the idea. In the first month: 1,065 registrations, zero crashes and zero account deletions.
1,065
registrations in the first month
0
crashes and account deletions in month one
7–8 wk.
of active development
10,000
workout videos across skill levels
The client
Peter Sowinski is a professional breakdancer, German champion and the founder of Breakletics, a workout method that blends breakdance moves with high-intensity interval training. The brand already had a loyal audience. What it needed was an app that could carry the business forward.
The challenge
Peter's first home-fitness app reached 100,000 downloads, then aged and was pulled from the stores. The goal wasn't a v2 but a foundation: stable across updates, familiar to existing users, ready for subscriptions and new markets, and live fast as a working product.
Changing one screen broke another, so every fix created new bugs.
A development cycle of six months or more would have cost the audience's momentum.
Subscriptions needed a content and progress logic behind them, not just a paywall.
Discovery & UX
We studied the old app and how people really used it. The core audience: women and teenagers, with Germany, the US and Japan as key markets. They already knew the product, so the task was a better app, not a new pitch.
We mapped the whole path: sign-in, quick questions, onboarding, picking a level, then warm-up, workout and cool-down. It shows where the paywall sits and how users resume where they stopped.
Home, catalogue, season, workout steps, video player, completion, additionals, premium and profile were first drawn in grey, so the structure was agreed before any colour was chosen.
Mobile app · iOS & Android
A dark interface with the brand's neon yellow as the action colour: energetic, like the workouts themselves.
A short guided tour explains the app step by step. Home then shows total points, a one-tap “Start next workout” and the weekly live Workout Jam for Plusmembers, so the next action is always obvious.
Workouts are grouped into seasons by level: Beginner, Advanced, Expert and Godmode. Every workout follows the same steps: warm-up, video workout, cool-down. Free workouts are marked, the rest unlock with a subscription.
A separate library of short sessions, a few minutes each. Inside a workout, users pick one of the suggested warm-ups from a bottom sheet or confirm they did their own.
The profile gathers the Plusmember upgrade, the merch shop and an intro video. Plans are managed in-app with a free trial, and goal, date of birth and body data lay the ground for personalisation.
Admin panel · Web
Content and users are managed on desktop, without developers: seasons, exercises, warm-ups, Zoom jams, promo codes and the home banner.
A searchable user table with progress, body data, status and Plusmember flag. One click exports the list to Excel for email campaigns.
All seasons in one list with language and number of workouts. Filters by level keep the catalogue manageable as it grows.
Order, season, cover, points and the free flag on one form, with English and German content side by side.
Warm-ups and cool-downs have their own list with duration, views and access type, so the team sees which sessions people actually use.
Tech stack
Speed and stability mattered more than anything. FlutterFlow let a small team ship iOS and Android from one codebase in weeks, on a clean architecture instead of legacy code.
iOS and Android apps from one Flutter codebase.
Subscription plans for 1, 3, 6 and 12 months.
Backend integration for content and progress.
Cover storage and video delivery for the workout library.
Results
The app went live three months after the idea and did what the old one never managed: it stayed stable.
Roadmap
Alongside the app we built a landing page that now serves as the entry point for new users.
“Their ability to balance technical expertise with client-focused collaboration made them an outstanding partner.”
All project milestones and deadlines were met without delays, ensuring a smooth development process and timely delivery. The app was successfully launched without major bugs or downtime, contributing to a positive user experience and initial adoption.
Peter Sowinski
Project Lead · Breakletics GmbH
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Dennis Polevik
CEO
Dennis Polevik
CEO
What happens next?
