Built an AI fitness coach that handles real programming: deloads, diet breaks, fatigue management, lean bulk cycles. First month free for beta members.
Hi everyone, I'm Aditya. IIT Delhi grad, fitness coach for 8 years, and AI developer.
I'm going to be upfront: I built Coachbase, and this post is about that.
The problem with every AI fitness app right now
I'm a CPT with nutrition coaching and special populations certifications. Eight years coaching people through cuts, bulks, recomps, hormonal conditions, metabolic issues, and injury comebacks.
Every major AI fitness app has the same flaw. They are tracking tools with a chat interface layered on top. The "AI" is either an algorithm adjusting reps based on last session, or a generic LLM being handed your logged data and asked to comment on it. Neither is coaching.
What a coach actually does happens between sessions: deciding whether to push load or pull back, whether this is the week to adjust calories or hold, whether what you are calling a plateau is recomposition happening under the surface. That decision layer is what every app was missing. Because apps are built by developers who read about training, not coaches who have done it for 8 years.
What I built instead
Deloads triggered by data, not a schedule. The system reads accumulated fatigue, RPE trends, sleep, stress, and performance relative to targets. When signals say the body needs a step back, it steps back.
Diet breaks inserted based on what your body is doing. If check-in data shows energy crashing, hunger unmanageable, and performance declining across multiple sessions, the system shifts phase automatically.
Lean bulk phases managed properly. Calories and training volume are tied together. A surplus without sufficient volume is fat gain. Both variables stay in sync through the entire phase.
Fatigue managed week to week, not on a fixed template. Check-ins capture RPE, soreness, energy, sleep, and stress. The following week is built from that data.
Special populations built in from day one. PCOS, insulin resistance, thyroid conditions, cardiovascular history, injury flags. These shape your exercise selection, intensity limits, volume caps, and nutrition targets from setup. They do not get silently overridden mid-programme.
Nutrition coaching, not tracking. The system reads your check-in each week and makes a decision. Scale not moving but waist shrinking? Recomposition. Hold calories. Consistently hungry? Nudge up, because a plan you cannot adhere to is not working.
Where it stands
Four weeks of beta. Real users running real programmes and progressing. Invite-only right now for onboarding quality control, not because it is unfinished.
First month completely free. You get three invite codes to share.
Questions about the programming logic welcome below.