Proxima
AI-Native Workout Programming Companion
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Jack Hanlon

Proxima - AI-Native Workout Programming Companion

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Proxima
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You download another "AI" fitness app. Answer the same ten questions. Get the same generic "personalized" plan. Proxima is different, it actually learns you over time. The program you're running in month six looks nothing like the one you started with, driven by your actual performance data. It remembers. It adjusts. It grows with you. For self-coached lifters tired of templates that ignore your injuries, your work schedule, and your bodyweight - this is what you've been looking for.

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Jack Hanlon
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I was inspired to build this product after being a winner at the Supabase Select Hackathon at Y Combinator in October 2025 for building an AI Agent Personal Trainer MVP called SupaBuff. I had played around with the idea that AI was being under-utilized and most Fitness apps were focused on the mobile UX and not the quality of the intelligence layer for program creation and personalization. It is now integrated with the Hevy fitness app and has had almost 20,000 site visitors, and 2,000 signups.
Keith Taylor

The month six plan looking nothing like month one is the right promise. Self-coached lifters stick on the same block until they hate it, then switch for no good reason. what actually triggers the adjustment in Proxima?. Plateau detection, RPE trends, missed session patterns, or something more continuous in the background?

Piotr Pasierbek

finally, something that acknowledges fitness isn't static. your capacity changes based on sleep, stress, work travel, recovery. been using generic programs that assume I'm always at 100%. how does Proxima handle those weeks when life gets crazy and you can only manage 2 workouts instead of 4?

Piotr Sędzik

finally, something that acknowledges fitness isn't static. your capacity changes based on sleep, stress, work travel, recovery. been using generic programs that assume I'm always at 100%. how does Proxima handle those weeks when life gets crazy and you can only manage 2 workouts instead of 4?

HenryArch

cool concept — the idea of a fitness program that actually adapts based on real performance data rather than just initial questionnaire answers is exactly what's missing in most workout apps. I've been exploring a similar philosophy with health tracking — I built ClimbUp (a stair climbing tracker for iPhone) and found that making everyday activity data visible and actionable is what actually motivates people long-term. How does Proxima handle deload weeks or recovery? Does it automatically adjust volume when it detects a performance dip?