Flex AI Workout Trainer & Log

Flex AI Workout Trainer & Log

Fitness Tracker & Gym Planner

2.4K ratings
294 reviews
Free
In-App Purchases

Details

  • Released
  • Updated

Features

Flex AI Workout Trainer & Log screenshot #1 for iPhone
Flex AI Workout Trainer & Log screenshot #2 for iPhone
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Flex AI Workout Trainer & Log screenshot #7 for iPhone
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About

This app uses AI to provide personalized workout plans and real-time form feedback for weightlifters. It tracks progress, offers adaptive progression, and includes motivational features like leaderboards and streaks. It's designed for all experience levels, from beginners to pros.

AI personal trainer
Real-time form feedback
Personalized workout plans
Adaptive progression
Strength tracking
Community leaderboards
Apple Watch integration
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What users say

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What's New in Flex AI Workout Trainer & Log

3.1

April 9, 2026

• New design: Flex now has a revamped interface with a modern look and improved usability. • Smarter AI trainer: Lex now creates and progresses your workouts with even more precision and intelligence. • Performance improvements and bug fixes.

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Subscription plans

Premium Subscription Monthly

1 month subscription for premium membership

$12.991 Month
How to cancel Flex AI Workout Trainer & Log subscription ⁉️
14

In-App Purchases

Free

1 Month Free Premium

Receive when referred by a friend

Events

Read more about Introducing Flex 3.0

Introducing Flex 3.0

Your AI Personal Trainer

Nov 11, 2025 Dec 12, 2025

Read more about AI-Powered Form Feedback

AI-Powered Form Feedback

Spot mistakes and refine your technique.

Nov 11, 2025 Dec 12, 2025

Read more about Introducing Flex challenges

Introducing Flex challenges

Stay active to earn points & achievements

Aug 31, 2024 Sep 29, 2024

User reviews

No response

Not working or responding to support requests

Buggy

I had a number of issues so contacted support and - they ignored me. Totally unsupported app so don’t waste your money.

Good but needs work

It’s a great app, trust me, although, it does need a lot of money to fully use the app, it is $10 a month for max, which isn’t that bad, but is still a little costly. I recommend that you use this, only if you are actually struggling to build a workout or if you need to lose weight. Thanks

Best fitness app! Very glitchy lately

I’ve been using this app for 3 years and it’s been amazing so far. But recently, it’s been very glitchy and there’s no way to contact app support. I’ve tried to do it through the app after uninstalling and reinstalling it and it’s still not working. I’ve tried doing it through their site but it also doesn’t work
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Annoying AI

Something is happening where my routines are duplicating exercises and it's time consuming and annoying to keep correcting and reorganizing my workouts. Won't be using anymore.

User experience

🐞

Reported Bugs

3 issues

App crashes on iOS 16 update

Bug

Inability to log workouts on previous days

Bug

Inconsistent syncing between app and Apple Watch

Bug

Requested Features

4 requests

Offline workout mode

Feature

Ability to save and reuse custom workout plans

Feature

Muscle group targeting and analytics

Feature

Social features and community integration

Feature

FAQ

What does Flex AI Workout Trainer & Log do?

This app acts as an AI personal trainer for weightlifters. It provides personalized workout plans, real-time feedback on exercise form using computer vision, and adaptive progression based on sports science principles. It also includes features to track progress, stay motivated, and connect with a community.

What are the key features of this fitness app?

Key features include an AI coach that generates personalized workouts, patented real-time form feedback for exercises like squats and deadlifts, adaptive progression and deloading, strength curve tracking, visual progress graphs, and integration with Apple Watch. It also offers gamified elements like leaderboards and streaks.

How much does Flex AI Workout Trainer & Log cost?

The app is free to start, with all core features included. Users can upgrade at any time for advanced AI coaching and premium analytics. This freemium model allows access to essential training tools without an initial cost.

What devices is this workout app compatible with?

The app is designed for iPhone and Apple Watch. It leverages Apple Watch for automatic tracking of sets, reps, and tempo, enhancing the user experience for those who use Apple's wearable technology.

Who is this app designed for?

This app is built for lifters of all experience levels, from beginners to professionals. It's particularly beneficial for those focused on hypertrophy (muscle growth) and strength goals who want to train smarter, progress faster, and perfect their lifting technique.