Building a Free Fitness PWA with Python and Flask

Tomek — Fri, 17 Jul 2026 12:01:27 +0000

About two years ago I decided to build something that would actually solve a problem I had myself.

Instead of another tutorial project, I started developing AthleteApp – a free Progressive Web App (PWA) designed for people who want to track workouts, nutrition and body progress in one place.

The project is built primarily with Python and Flask.

Why a PWA?

I wanted users to access the application instantly without downloading anything from an app store.

The application can be installed directly from the browser and works on desktop, Android and iOS.

Current features

Workout diary
Nutrition and macro tracking
Progress charts
Personal records
Body measurements
Trainer profile
AI-powered exercise analysis (beta)

Challenges

Building a fitness application is much more than creating CRUD pages.

Some of the challenges included:

designing a large nutrition database,
keeping the interface fast,
creating meaningful statistics,
implementing AI-assisted exercise analysis,
maintaining good SEO despite being a web application.

SEO for a Web App

One of my recent goals has been improving discoverability.

The project now includes:

structured data (Schema.org)
FAQ markup
optimized metadata
technical documentation
continuous content updates

Search engines are already starting to recognize AthleteApp as a real software product, which is exciting to see.

What's next?

I'm continuously improving the application by adding new training features, expanding the nutrition database and improving the AI assistant.

Building software is a marathon rather than a sprint, but seeing the project grow step by step makes the journey worthwhile.

Website:
https://athleteapp.pl

DEV Community: Tomek

Building a Free Fitness PWA with Python and Flask