Introduction

When we first started working on 30 Day Fitness back in 2015, we noticed something: most fitness apps were trying to do too much. Long, complicated programs. Tons of features. But what people really needed was simple structure and motivation — something they could start right away and actually stick to. That’s the idea that kicked this app off.

Problem

Back then, fitness apps weren’t great at helping users stay consistent. Most plans felt generic, and there wasn’t much accountability. People would download a fitness app, try it for a few days, then forget about it. No daily check-ins, no progress tracking, and no sense of completion — which meant users dropped off quickly.

Solution

We built a native app from scratch — using Swift for iOS and Kotlin for Android. The focus was clear: one workout a day for 30 days. No fluff. Each challenge was easy to start, had a clear structure, and gave users a sense of progress. The design was clean, the tone was encouraging, and the experience was built for momentum.

Goals

Create something simple and clear: 30-day fitness challenges that feel doable.
Help users build consistency — not just by working out, but by showing up every day.
Make the app lightweight and beginner-friendly.
Let users train anywhere, even offline.

Technology stack

Firebase

Swift

Kotlin

How We Did It

We kept the interface super minimal — no clutter, just today’s workout front and center.
Introduced gamified features like streak tracking and badges to keep motivation high.
Used Firebase to handle notifications, user data, and analytics.
Enabled offline access so users could complete workouts anywhere, even without Wi-Fi.
Got real feedback early from test users to make sure it stayed practical and motivating.

Results

30 Day Fitness became one of the early players in the “challenge-based” fitness space.
Thousands of users completed their first full fitness challenge ever using the app.
The app maintained a 4.5+ rating and had strong daily retention across multiple cycles.
It was shared organically by users and inspired dozens of similar apps that followed.

65%

Increase in workout completion rate

45%

Growth in monthly active users

Final Thoughts

This app wasn’t built to impress with features — it was built to help people finish. And that’s what made it work. It helped users break the cycle of “start and quit” by giving them small, daily wins. In the end, that’s what fitness is really about — not intensity, but consistency. And that’s exactly what 30 Day Fitness delivered.

30 Day Fitness – The App That Helped People Finally Stick to Fitness