A coach that knows you.
Not a chat window that starts from scratch at every session. Cox remembers what you tell it and builds a picture of you over the weeks — a briefing in the morning, a debrief after the session, the week on Sunday. And in between it knows when to stay quiet.
The briefing knows how your night went
Between seven and ten in your time zone — not ours. What is on today, where you stand, and what the one has to do with the other. If you hit a personal best yesterday, that is in there too.
There is no separate daily summary: the briefing is it. An app that tells you the same thing three times a day gets swiped away.
Briefing in the morning. Sample data.
It asks — and knows what you did
Not “how was your training?”, but the right question about the right session. It sees whether that was the planned one or an extra, how it compares with your recent ones, and where you stand in the week.
What you answer stays attached to the session: effort, how it felt, which shoes. Next time you look at that day the conversation is still there — not buried somewhere in a chat log.
The conversation lives on the session. Sample data.
It gets to know you — one question at a time
A real coach knows after six months that you never have time on Tuesdays, that your back has opinions about heavy squats, and that you don't want to train on holiday. Cox builds that picture the same way: at most one question a day, from the area it knows least about.
The longer you know each other, the less often it asks. And what you mention in passing counts just as much — it will not ask again about something you have already said.
An ordinary conversation. Sample data.
It is not allowed to bury you.
A coach that writes at every blip gets muted. So every unprompted message has five hurdles to clear before it goes out.
Quiet hours are absolute
It does not write at night. Not even when it considers something urgent — no signal is important enough to wake you.
One topic a day
If it has already written to you about your sleep today, nothing more on that topic follows. The getting-to-know-you question steps aside as well.
Spacing and a daily cap
At least half an hour between two unprompted messages — the briefing and the debrief count towards it. Plus a daily ceiling you set yourself.
It waits for your answer
If it asked you something and you have not replied yet, it does not push the next one after it.
What it reacts to: a clear drop in your recovery values, heart rate variability falling over several days, poor sleep, too many hard days in a row, a missed session. The thresholds are your own — and adjustable.
The week, summed up and put in context.
What was planned, what happened, how much volume each muscle group got, which patterns repeat. Plus what the week proved — a new best, a streak you kept, a race getting closer.
Patterns and signals of the week. Sample data.
The long look back. Sample data.
In the app. And on Telegram, if you want.
The coach lives in the iPhone app, in the browser and, if you want, on Telegram — with the same memory behind all three. Where you reply is up to you; it does not start over in three places.
Speak instead of typing
Typing is a nuisance after a session. Send a voice message — the transcript is shown back to you, so you notice when it misheard you.
Photos
A label, a plate, a machine in the gym. Works in the app and over Telegram, with the same path behind it.
You choose the channels
Separately by kind: coaching, reports, signals. Each kind can go to the app, to your phone or to Telegram — or nowhere.
What the coach is not.
- It makes no guesses about your health, and what it says about your readings is not a medical assessment. Cox is a wellness companion for your training — not medical advice.
- It invents no numbers. Load, recovery, volume and progression come from the engine; the language model does the wording.
- It does not discuss supplements and names no preparations or doses.
- It decides nothing behind your back: what it wants to change in your plan it proposes — and applies only once you agree.
You are told during setup that you are writing with an AI system, and it stays visible throughout. Processing your data with an AI model requires your own separate consent — and you can withdraw it.
Best you read what it writes yourself.
The coach is part of Cox Strength, not a separate subscription. Closed beta: tell us what you train — we will get in touch as soon as a place opens up.