How it works
One loop. You ask, you train, you rate each set, he reacts.
Everything below is what the app actually does, written from its own source rather than from a brochure. Where it refuses to answer, that is a feature and it is described here too.
- Day one is a deal, not a promiseJerry asks your bodyweight, your experience, how many days a week you train, and your current lifts if you know them. Then he tells you plainly that on day one he has averages for someone your age, sex and weight, and nothing about you. He asks one thing in return: rate your effort honestly. Round up to look strong and he coaches a fake version of you.
- He builds the plan, then promises to grade itYou get a multi-week plan and a first session, labelled for what it is: true for the average lifter like you, not yet true about you. Every call he makes about you gets graded, hits and misses alike.
- Three ways inLet him plan the whole session, pick the muscles you want, or freestyle and log whatever you do. If you pick muscles he does not simply obey: if a muscle still needs recovery, or your weekly workload is already high, he trims or declines it and shows a receipt explaining exactly why.
- Rate each set, and he reacts before the next oneAfter every set you say how many reps you had left. He compares that against what he expected and tells you in one line whether you are on track, drifting, or still teaching him your baseline on a new lift. If you are fading faster than planned he cuts the remaining sets on the spot and says that the cut protects your recovery.
- The weight goes up when you have earned itNot on a calendar. He holds the load and asks for one more rep, then adds the plate once the reps are there. It runs on the reps you actually completed. What you type about your own effort can hold the weight back, never push it up.
- Tell him something and watch it landReport an injury and he names the lifts he just removed. Say a muscle is sore and he shows you the extra margin he left on the bar. Travel, get sick, change your equipment, and the plan changes with a receipt attached. If you quietly use a lighter weight than he asked for, he notices, and if you do it again on another day he lowers the prescription himself instead of arguing with you.
- It gets more personal over timeEvery number starts as an honest average. As you log real sets he shifts onto your own body and shows you how far he has moved and how sure he is. The pace follows your evidence: sessions with a lot of real working sets move him onto your numbers faster than the calendar does. Three of the deepest readings are the exception and hold a hard floor of fifteen sessions' worth of evidence, and a session only counts towards that twice a day and ten times a week at most, so the fastest honest path opens them on your eighth training day across two weeks. Below that the sample cannot mean anything, and the one that narrates how you have changed waits for two months between your first set and today as well. He says which, by name, on the screen where it matters.
Four moments
Where it stops feeling like an app.
Hard Truths
When your own data shows a habit working against you, he says it out loud, using only your logged numbers. Before he speaks he rules out the innocent explanations: an injury, a beginner still learning, a planned easy week, a comeback. Each confrontation carries a receipt naming whose data, how much of it, and what he checked first. If he cannot rule out the innocent explanation he stays silent, because one false accusation costs trust permanently.
The Teacher
Instead of a generic tips feed, he teaches one principle at the exact moment your own training demonstrates it, and cites the research behind it. One thing at a time, never repeated, never invented. The lesson itself carries no numbers, because your numbers are in the receipt directly above it.
The day you get hurt
This is where other apps go quiet. Tell him something hurts and he keeps coaching: removes what is unsafe, trains everything else, and brings the injured movement back on a gradual ramp. Pain above the clinical line holds the ramp where it is rather than letting the calendar advance it. The screen shows the honest number of days until full load, and it is the same number the engine is using.
The set he watched
Prop the phone up and he will watch a set. He counts your reps and measures how much your speed dropped from the first to the last, which is the clearest sign of how close you came to failure. Then he tells you what he saw and compares it against what you logged. He is not allowed to change your weight from it, and he says so.
On the screen
The number on the screen is the number the engine is using.
When you report pain, the ramp does not advance on a calendar. Pain above the clinical line holds it exactly where it is. There is no separate optimistic figure shown to keep you feeling good, because a comforting number you cannot act on is worse than a hard one you can.
Every confrontation carries a receipt in the same style: whose data, how much of it, and what was ruled out before he said anything.
Right knee · returning to load
Squats are out. I am training everything else at full effort. You logged pain at 6 out of 10 on Tuesday, which holds the ramp where it is rather than advancing it.
Hard truth
Your legs have sat under the growth minimum for three weeks while your pressing runs full.
- from
- your last 9 sessions
- ruled out
- injury, planned easy week, comeback from time off
- if unsure
- he says nothing at all
The part that matters most
He would rather refuse than guess.
Most coaching apps overclaim, and once you catch one overclaim you quietly discount everything else. This one inverts that: it flags every guess and owns every miss, so the confident claims actually carry weight.
Saying nothing is built in more carefully than speaking is. The cardio engine has one way to give you a pace and seven separate ways to decline, and each one names what is missing. The camera has one way to say it saw your set and several to say it did not. Ask him a question in plain language and every figure in the answer has to trace back to a number the engine really produced: if one does not, the whole answer is thrown away and a plainer one takes its place.
And one model is barred from speaking about you at all. A recovery model can always flatter itself by measuring numbers it invented, so ours is marked in the code as exactly that and is kept out of every personal claim. It cannot be wrong, which is why it cannot be evidence.
Your data
Easy to leave, hard to replace.
Your training is computed on your device by our own engines. Bring your history in from the big logging apps so switching does not mean starting at zero, and export your last 90 days as a single file whenever you want, and the whole record back to your first set with Pro. Nothing is held hostage to keep you subscribed.
Losing your history is one of the loudest complaints in this category, and making cancellation difficult is what gets an app called a scam. We would rather be the product that is easy to leave and hard to replace.
Exactly what does and does not leave your phone, including the six things that could and the one of those we have removed, is set out in the privacy policy.
See it for yourself
The claims on this page are checkable.
Not by trusting the page. By running the arithmetic.