I built the coach I needed at 374.

I'm not a fitness influencer. I'm a software engineer who got to a place — 374 lb at 6'5" — where I understood that the next decade of my life was going to be shaped by what I did about it. Not in some inspirational Instagram sense. In a "your knees are going to give out, you won't see your kids grow up the way you want to" sense.

I started 75 Hard because I needed a framework that wouldn't negotiate with me at 9pm on a Tuesday. Two workouts a day, a gallon of water, ten pages of reading, a daily progress photo, a clean diet, no alcohol — for 75 straight days. Miss any one of them, you start over at Day 1.

But every tracking app I tried did the same thing wrong: it logged my behavior and told me what I already knew. It didn't coach me. It didn't pull my workouts and ask why bench had stalled. It didn't notice I was hitting protein but missing water four days in a row. It didn't sit down with me Sunday morning and walk through what actually happened that week.

So I built the one that did.

What Coach374 actually is

Three things — and these are the three things every program needs and almost never has all of:

1. A plan that's yours. At signup, the AI runs a structured interview — your height, weight, body comp, past attempts, equipment, dietary restrictions, strength baselines, goals. Then it writes a complete program: split, prescribed loads, meal plan with macros, schedule, off-day instructions. You get it delivered as a Word document. The exact prompt that built it is saved so you can re-read why you're doing what you're doing.

2. A coach that pays attention. Every week, Coach374 pulls your last seven days of data — workouts, meals, water, weigh-ins, photos — runs them through a structured analysis, and surfaces a five-minute review. Wins, concerns, and 2–4 targeted questions. You answer them in chat. If there's a data-grounded adjustment worth making, the coach proposes it: bump water by 16 oz, swap Tuesday to rest, extend the program. You approve any subset and the plan updates.

3. Tracking that doesn't suck. One screen for the day. Macros, water, workouts, push-up bridge, weigh-ins, photos. A meal logger you can use with one thumb. A chef AI named Matty who knows what's in your cupboard and can save the recipe you just made and log it to dinner without you opening another menu.

What it isn't

It's not a calorie counter that judges you. It's not another "log it, win!" app. It's not a community feed where strangers comment on your photos. It's not trying to be your therapist.

It's a tool I built because I needed it, and because I think the right shape of software here is: track what's true, coach what matters, and stay out of the rest.

About the AI

The AI Coach is Claude. The plan generation is Claude Sonnet 4.6 — a one-shot, high-stakes call. The weekly review and the daily Chef Matty chat run on Claude Haiku 4.5 — fast and cheap enough that I can run them unlimited for paying users without sweating the bill.

The system prompt is tuned to one voice: warm, direct, never lecturing. The same voice I'd want a human coach to use with me. No "as an AI…" caveats. No empty motivational platitudes. Just specific, data-grounded feedback about what your week looked like and what to do next.

Every adjustment the AI proposes is re-validated server-side against safety guardrails. Water can't drop below 64 oz/day. Protein has a per-bodyweight floor (1 g/lb of your latest weigh-in). Calories live in a 1500–5000 window. The AI doesn't get final say. You do.

The Coach also reads from whatever fitness tracker you already wear — Apple Health, Health Connect, Samsung Health, Fitbit, Garmin, Polar, Google Fit. Sleep totals, resting heart rate, steps, and workouts feed into the Sunday review alongside what you logged manually. If your resting HR is creeping up week-over-week, the Coach will notice and ask about it — recovery is one of the few things 75 Hard doesn't directly track but matters a lot.

Where it's headed

Coach374 is in private beta. I'm letting people in by batch because I want to talk to every early user, watch what breaks, and tune the AI's voice based on real conversations — not just my own. If you're on the list, you can expect an invitation within a few weeks of joining.

Coach374 ships as fully native iOS and Android apps — same coach, same data, optimized for the phone you already pull out twenty times a day.

Built solo

I built Coach374 myself, mostly evenings and Sunday mornings. If you have feedback, ideas, or you want to talk about a program-specific use case I haven't thought of — email me at hi@coach374.app. I read everything.