Gymnasia is a mobile application built with React Native and Expo that works as an intelligent personal trainer. The app allows you to create and manage workout routines, track your diet and body measurements, and features an AI chatbot that acts as a training assistant.
The project follows a local-first philosophy: all core functionality works offline, storing data locally on the user's device.
Workout Routines
Create custom routines with exercises, sets, reps and weights. Each routine can be categorized (strength, cardio, flexibility, etc.) and customized with icons. During training, a rest timer with sound alert notifies you when to continue.
Exercise Library
Open-source exercise repository with AI-generated images showing correct execution, in both male and female versions. Exercises include muscle group, required equipment, difficulty level and detailed instructions. Users can also create custom exercises.
AI Assistant
Built-in chat with language models (compatible with OpenAI, Anthropic and other providers) that works as a virtual personal trainer. The chatbot has access to your routine context and can suggest exercises, answer technique questions or help you plan your training.
Diet Tracking
Daily meal logging with calorie and macronutrient calculation (protein, carbs and fats). Set personalized nutritional goals.
Body Measurements
Track weight and other body measurements with historical data to visualize your progress.
The project is an npm workspace monorepo containing:
The mobile app uses AsyncStorage for local persistence and Expo SecureStore for API keys. Exercise images are served from the GitHub repository and cached on-device.
The project is open source and available on GitHub.
If you like the project, consider giving it a star on GitHub.
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maximofn@gmail.com
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Let's talk.
maximofn@gmail.com
Machine Learning and AI specialist. I develop solutions with generative AI, intelligent agents and custom models.
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