Flex AI Workout Trainer & Log
Free
rated 4.7 stars
About Flex AI Workout Trainer & Log
Whether you’re chasing size, strength, or consistency, Flex uses real-time AI to guide every rep, adjust your program, and keep you motivated through challenges, leaderboards, and streaks.
- Your AI Coach, Every Rep
Personalized workouts built automatically by AI personas that learn your goals, history, and preferences.
Real-time form feedback powered by patented computer-vision AI — get instant corrections on squats, bench, deadlift, rows, and more.
Adaptive progression and deloading backed by sports-science principles — no spreadsheets, no guesswork.
- Train Smarter — See Results
AI tracks your strength curve and increases weight when you’re ready.
Visual progress graphs show PRs, volume, and recovery trends.
Track sets, reps, and tempo with a tap — or automatically with Apple Watch.
- Stay Motivated & Connected
Join a global community of lifters.
Compete on leaderboards, build streaks, and earn badges.
Post progress photos, celebrate milestones, and share results.
- Accessible to Everyone
Free to start with all core features included.
Upgrade anytime for advanced AI coaching and premium analytics.
Designed for all experience levels — from beginners to pros.
- Why Flex AI
Real-time AI form feedback (patented)
Adaptive, science-based programming
Progress tracking & recovery insights
Gamified streaks + leaderboards
Apple Watch integration
Built for hypertrophy & strength goals
Start Training Smarter — Today
Download Flex AI and experience personal training powered by real AI.
Perfect your form. Unlock your best lift. Train smarter — free on iPhone + Apple Watch.
Flex AI Workout Trainer & Log Screenshots
Reviews for Flex AI Workout Trainer & Log
J__Roon
Finally
As a lifelong fitness and gym rat, I’ve searched for a way to track my workouts that wasn’t cumbersome and slowed me down in the gym. I love that all my workouts can display nicely on my Apple Watch and then I can write custom exercises into my programming and save them. I also really enjoy the community aspect and it keeps me motivated on days that I don’t really want to work out. Overall fantastic app and I’m a happy customer.
Mia T.L.
New Subscription Ruins It
I love this app, it has helped a lot during the transition from high school athlete to someone who doesn’t know how to create workouts for themself. I bought the subscription this summer and have loved it. A few weeks ago I was enjoying the AI options and customs workouts til I couldn’t use them anymore. Taking away a resource and needing you to pay more for it is cruel. And I can’t even up my current subscription I have to completely pay for a new one of over 100 bucks. I’m a broke college student I can’t pay that when I already paid over 80 for a whole year. I should at least be able to add onto my subscription if you are going to change the app. I love it but this last update has made me a little upset with the app.
moonmjh
AI and changes
I don’t understand why do you have to have AI in a working out platform? I don’t need him to talk to me. I just wanna work out. It truly doesn’t make any sense. I want the old version back.
Lexie2badd_
Best personal trainer app
I love this app because you were able to track all of your workouts. You can see what weights you use previously and it’ll also auto progress for you when it feels like you’re ready for a higher weight. They also have form correctors where it’ll show you if you’re doing the right form. It also messages you and remind you to do your workout you could preset it for certain days so you know exactly what workouts to do. They have warm-ups mobility like you could use it at gym. I love it.
alexrmiller
Solid workout trainer
Tracking every lift is important and this app makes it easy to make routines and record sets
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