FLEX Stronger

FLEX Stronger

Velocity-based Training (VBT)

8 ratings
7 reviews
Free

Details

  • Released
  • Updated

Features

FLEX Stronger screenshot #1 for iPhone
FLEX Stronger screenshot #2 for iPhone
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FLEX Stronger screenshot #4 for iPhone
FLEX Stronger screenshot #5 for iPhone
FLEX Stronger screenshot #6 for iPhone
FLEX Stronger screenshot #7 for iPhone
FLEX Stronger screenshot #8 for iPhone
FLEX Stronger screenshot #9 for iPhone
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About

This app revolutionizes weight training by syncing with a sensor to provide real-time performance feedback. Track, manage, and review your training like elite athletes, with automated workouts and group training options. It offers detailed metrics, video recording with data overlay, and a community feature for sharing and downloading workouts.

Real-time performance feedback
Velocity-based training (VBT)
Automated workouts
Group training for up to three people
Video recording with synced data
1RM prediction
Workout creation and sharing
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What's New in FLEX Stronger

3.4.1

July 6, 2026

- Minor bug fixes.

User reviews

Latest update crashes with iOS 18

App keeps crashing on iOS 18. Delete and reinstall doesn’t help either

Great In-Set Interface

Love it during the set. It’s not as intuitive looking back at information.

What I need for 5 starts (please make this happen!!!)
1. I need ability to input pounds and not kilos when it asks what weight I’m lifting (dumb American here)

What I’d love to be able to do:
1. See all the graphs (velocity/force/work/power/bar path) more easily when reviewing results
2. If I use a tablet/laptop witha bigger screen can I see all those meters at the same
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App crashes frequently

I’m sick of the app crashing in the middle of a workout. I lose my stats/progress and have to restart the workout. Sort the app out ASAP!
Consider including an option to continue favourite workouts that have not been completed.

Awesome!!!

Great technical support. Easy to use and a great tool to help train athletes or yourself. Would highly recommend for anyone serious about training.

Great device!

Such a cool app!! Really easy to use and I really like how it displays bar path.

Developer apps

FAQ

What is FLEX Stronger?

FLEX Stronger is a health and fitness app that uses velocity-based training (VBT) to provide real-time feedback on your weightlifting performance. It syncs with a FLEX barbell sensor to track metrics like velocity, power, and distance.

What performance metrics does FLEX Stronger track?

FLEX Stronger precisely tracks Mean and Peak Velocity, Mean and Peak Power, Distance, Height, Eccentrics, and Position. It also offers live bar path tracing and allows you to set targets for these key performance metrics.

Can I use FLEX Stronger for group training?

Yes, FLEX Stronger supports group training for up to three people. You can complete regular training, pre-programmed workouts, or even the 1RM prediction with your training partners.

Does FLEX Stronger offer video recording?

Yes, FLEX Stronger has a Video Mode that records your sets with synced data overlaid on the saved file. It also features hands-free start and stop functionality for easy recording.

How does FLEX Stronger handle workouts?

FLEX Stronger allows you to create custom workouts, download sessions from the community, and complete automated workouts that guide you through exercise, weight changes, targets, and rest times.

What is the 1RM prediction feature in FLEX Stronger?

The 1RM prediction protocol in FLEX Stronger helps you gauge your current strength and readiness levels without needing to perform an actual 1RM attempt.

Is FLEX Stronger available on multiple devices?

FLEX Stronger is available for iPhone, iPad, and iPod, as indicated by its supported devices.

How often is FLEX Stronger updated?

The latest version of FLEX Stronger is 3.3.6, and it was last updated on March 13, 2026, suggesting a commitment to regular updates.