Founding members $17.99/mo · $29.99 after launch
The workout tracker that actually coaches you.
Rex is an AI personal trainer. He builds your plan, reviews every session, adjusts when your week falls apart, and keeps you honest. You train in the app. You talk to him in chat.
Trainer Rex
your AI trainer
Sound familiar?
Good training is expensive
A great personal trainer does a lot, but at $100–150 an hour most people can only afford one session a week, if that.
Tracking apps just record
Loggers store your sets and draw charts. They do not review your session, change the plan, or follow up when you drift.
Motivation fades
Without accountability you start strong, then quietly give up by week four.
My tracker had all the data and none of the answers. So I built the coach.
3 steps to get started
Meet Rex
Goals, equipment, injuries, and the days you can train. About two minutes.
Train and log
Follow the plan in the app. Log your sets and how each session felt.
He reviews and follows up
Feedback after every workout, plan changes when you need them, and a nudge when you slip.
What Rex does as your trainer
Writing the plan is the easy part. The job is reviewing your sessions, adjusting the plan, and keeping you honest.
The tracker
Fast logging, prefilled from last time
Your sets, reps and weights are already there when you walk in, taken from your plan and your last session. Change what you actually did and it saves itself. Swap an exercise if the rack is busy.
Session reviews
He reviews how it went
Numbers plus how it felt. Too easy, too hard, or a twinge in your knee: Rex answers with clear next steps instead of a silent chart. Finish a workout and he tells you what he saw.
Squat felt heavy
Rex: You hit every rep. We hold the load next week, then push.
Bench felt easy
Rex: Add 2.5kg next session. Keep the same reps.
Left knee: a little tender
Rex: Noted. We swap deep singles for safer volume.
Progress
Your week at a glance
What is planned, what you finished, what is next, and whether you are actually getting stronger. Streaks, volume, personal records and body measurements build up as you train. Nothing to set up.
Bring your own program
Already following something?
Paste it, photograph the whiteboard, or upload the PDF. Rex reads it, matches the exercises to his library, and puts it on your training days. You keep your program and get a coach on top of it.
Also remembered: left knee note · prefers dumbbells
Accountability
He keeps you on track
A nudge when you fall behind, check-ins, and a weekly review of how the week actually went. He remembers your injuries and preferences, so you never explain your bad shoulder twice.
How Trainer Rex compares
Everything a great personal trainer does, without the hourly rate or the waiting list.
Swipe the table sideways to compare
| Personal trainer | Training apps | Trainer Rex | |
|---|---|---|---|
| A month of real coaching | $400–6001 session a week | Not offeredlogging only | $17.99unlimited |
| A plan that adapts every workout | |||
| Remembers your history and injuries | |||
| Reviews your sessions and checks in | |||
| Available at 6am on a Sunday | |||
| Month to month, cancel anytime |
Rex costs less than 10 minutes with a personal trainer.
Strong logs. Freeletics runs journeys. Apple tracks and cheers. Rex coaches.
Is Trainer Rex right for you?
Rex is for you if
- You want a personal trainer without the hourly rate
- Loggers alone have not kept you progressing
- You need someone who reviews your sessions and follows up
- You want a plan that flexes with home, gym, or limited gear
- You are new to lifting, or getting back after time off
Maybe not for you if
- You need someone watching your form in the room. Rex coaches through your phone.
- You mainly want calorie and meal tracking. He can advise on food, but that is not the product.
- You want a blank logger and intend to program everything yourself.
Why I built Trainer Rex
I train 3–4 times a week but kept stalling. My tracker had the data and none of the answers. I wanted a real personal trainer, but not at $100–150 an hour every week.
So I built Rex to do what a great PT does: watch your training, give feedback, adjust the plan, and keep you on track. I use him myself, every week.
Everything you need. One price.
A personal trainer and a full tracker for less than 10 minutes with a PT.
Founding member price
$17.99/mo
Locked for as long as you stay subscribed.
Going to $29.99/mo for everyone who joins after launch.
- ✓Your AI personal trainer, unlimited
- ✓Personalised plans and ongoing adjustments
- ✓Full workout tracker, history and records
- ✓Session reviews and check-ins
- ✓Progress charts and body measurements
- ✓Import your existing program
- ✓Works on any device
No credit card needed · Cancel anytime
Questions? Rex has answers.
Rex is AI, and I would rather say so up front. He is built on top of a large language model, wired into your training data, with a memory of your history, injuries and preferences. That is exactly why he can answer at 6am, never forgets your bad shoulder, and costs less than one session with a human trainer.
Strong logs sets. Freeletics runs preset workout journeys. Apple tracks activity and cheers you on. None of them read your session and change your plan because of it. Rex plans, reviews, adjusts and holds you accountable, with a full workout tracker in the app.
No. Everything works in the web app: your plans, logging, progress, and Rex's feedback after each workout. Telegram is optional and it is the nicer way to reach him between sessions, so you can ask a question mid-workout without opening the app. It is free and takes about a minute to connect, and you can skip it entirely. Reminders and recaps arrive by email if you prefer.
No. Tell Rex your goal and what equipment you can get to. He builds the plan, picks your starting weights, and explains anything you have not done before.
Yes. Paste it as text, upload a photo of the whiteboard or a PDF, and Rex reads it, matches the exercises to his library, and schedules it on your training days. You keep your program and get the coaching on top.
Yes. Rex builds around what you actually have, from a full commercial gym down to a pair of dumbbells or nothing but your bodyweight.
Tell Rex during setup and he works around it, avoiding movements that are a bad fit and remembering it for every future session. He is not a physiotherapist though. If something hurts, or you have a medical condition, see a professional first. Rex will not diagnose you.
It stays in your account and is used to coach you. It is never sold. Your training data is processed by our AI provider to generate Rex's replies, which is what makes the coaching possible. Full detail is in the privacy policy, and you can delete your account whenever you want.
You get full access for 7 days with no card required. After that it is the founding member price per month to keep going, billed monthly, cancel anytime. There is no free plan after the trial, but nothing gets deleted if you stop: your plans and history wait for you.
Cancel in two clicks from your profile, any time, and you keep access until the end of the month you paid for. If you subscribe and it is genuinely not for you, email support within 30 days and we will refund you.
Stop overpaying for a personal trainer.
7 days free. No credit card needed. If Rex does not earn his spot, walk away.
Setup takes about 2 minutes.