Show HN: I built 19 AI agents because one wasn't enough to coach my workouts https://ift.tt/hyKNWnw

Show HN: I built 19 AI agents because one wasn't enough to coach my workouts Hey HN, I've been lifting for years and got frustrated with fitness apps that either (a) generate a static plan and forget about you, or (b) require manual logging with no intelligence. So I built Arvo—an AI personal trainer that adapts after every single set, not just at the start of your workout. Why 19 agents instead of one? Each handles a specific job: - Exercise Architect (selects movements based on equipment/goals) - Load Navigator (calculates weight adjustments based on RIR) - Volume Manager (tracks MEV/MAV/MRV per muscle group) - Pattern Scout (extracts insights from natural language notes) - Movement Adapter (biomechanical weight conversion when swapping exercises) They coordinate to make decisions in <500ms. Example: You finish set 1 of bench press, felt easy (RIR 4). Arvo bumps weight +2.5kg for set 2. Set 2 was a grind (RIR 1). Arvo keeps the weight but suggests longer rest. https://arvo.guru November 28, 2025 at 11:43PM