Plenty of fitness apps bolt on a chatbot that knows nothing about you. I wanted the opposite, so Delts Premium includes an AI Coach that actually sees your training.
The coach has context on your real workouts: the weights you logged, your progress over time, and your goals. So when you ask whether to push your next session, it's reasoning over your actual numbers instead of generic advice. It also accepts photo attachments, which is handy for form checks or a piece of gym equipment you want explained.
It's powered by Gemini. The interesting build problem was the context layer: turning logged sets, RPE, and progress into something the model can reason about cleanly without dumping your entire history into every prompt.
The AI Coach is a Premium feature; the core tracking app is free. I build solo and I'm an ACE Certified Personal Trainer, and the app is open source under MIT, so you can see how it's wired.
Open source on GitHub:
https://github.com/apoorvdarshan/delts
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