Flex
Free workout plan appBuild muscle or lose weight, your way
Highlights
What you can do with it
- Following a weekly muscle-building or fat-loss routine
- Learning how to perform exercises correctly
- Sharing a personalized plan with training partners
How to use it
- 1 Download the Flex app.
- 2 Pick an existing plan or build your own from scratch.
- 3 Follow the guided exercises in each session.
- 4 Log weights and track your progress in the charts.
- 5 Use challenges and reminders to stay consistent.
Who it is for
Pros
- Free to use with a large plan library
- Full customization alongside ready-made plans
- Progress tracking is built in
Limitations
- It is a mobile app, so you need a compatible device
- Free access and available features can change over time
- Plan quality varies, so check that a plan matches your level
What Flex is
Flex is a free mobile fitness app for people who want to build muscle or lose weight without designing a program themselves. It ships with more than 1,000 workout plans covering muscle gain, fat loss, and strength enhancement, and it also lets you build your own from scratch. Beyond the plans, the app teaches exercise form, tracks personal bests, and visualizes progress in charts so you can see whether the work is paying off. Gamified challenges, friendly reminders, a weight log, a calorie calculator, and music control are included, and the customized plans are described as combining trainer expertise with AI rather than being generated blindly.
What you can do with it
- Choose from more than 1,000 ready-made workout plans
- Build, customize, and share your own training plan and schedule
- Learn how to perform each exercise properly
- Track personal bests, weight, and progress in chart form
- Stay motivated with challenges, reminders, and gamified elements
Who it is for
- Beginners who need structure rather than guesswork
- Lifters who want to log strength and see progress over time
- People who want to share a plan with a training partner
- Anyone who responds well to challenges, streaks, and reminders
What to watch out for
A large plan library means quality varies, so read a plan before you commit and make sure it matches your experience, goals, and available equipment. Because it is a mobile app, you need a compatible device, and the site was not reachable at the time this entry was compiled, so verify current availability before downloading. Free access, plan counts, and features can change, and any fitness app should be treated as general guidance rather than medical or professional coaching advice. If you have an injury or a health condition, talk to a qualified professional before starting a new program, and increase load gradually rather than chasing fast results.
FAQ
Is Flex free?
Yes, it is described as a free mobile app.
How many workout plans are included?
More than 1,000 plans covering muscle gain, fat loss, and strength.
Can I make my own plan?
Yes, you can create, customize, and share personalized workout plans.
Why it is free
What the official page says： 免费
Free limits, trial length and features are decided by the official site and can change at any time.
Product preview
Screenshot archived from the listing page, for preview only.
