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Best Flex Fitness Training Apps

250+ iOS apps curated and reviewed

4.8 avg rating
20 free apps
Updated October 2026

Flex AI Workout Trainer & Log is the household name in flex fitness training, but it's far from the only option. We track 250+ alternatives and competitors on iOS — many free, many higher-rated than you'd expect.

Compare top Flex Fitness Training Apps (October 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Flex AI Workout Trainer & LogFlex AI Workout Trainer & LogFree4.6★ (2.4K)NoYesNov 2026
2Flex Studio LKFlex Studio LKFree—NoNoSep 2026
3FLEX Health & FitnessFLEX Health & FitnessFree5.0★ (31)—NoOct 2026
4Stretch Plus FlexStretch Plus FlexFree—NoNoOct 2026
5Flex Fitness Jungle GymFlex Fitness Jungle GymFree—YesNoMay 2026
6Flexx Strength TrainingFlexx Strength TrainingFree—YesNoMay 2026
7Flexfit Training CenterFlexfit Training CenterFree—NoNoMay 2026
8FlexSportFlexSportFree—NoYesMay 2026

Top Picks for Flex Fitness Training

Flex AI Workout Trainer & Log#1

Flex AI Workout Trainer & Log by Flex Artificial Intelligence Inc.

Fitness Tracker & Gym Planner
Editor's Choice
💪 Health & Fitness
4.6😊(2.4K ratings)
FreeIn-App Purchases
Flex AI Workout Trainer & Log screenshot 1
Flex AI Workout Trainer & Log screenshot 2
Flex AI Workout Trainer & Log screenshot 3
Flex AI Workout Trainer & Log screenshot 4
Flex AI Workout Trainer & Log screenshot 5
Flex AI Workout Trainer & Log screenshot 6

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.

What We Love

  • 🚀 Detailed workout tracking
  • 👍 Customizable workouts
  • 🔒 Comprehensive exercise library
  • 💡 Helpful progress tracking
  • 👍 Clean and intuitive interface
  • 🚀 Seamless Apple Watch integration

Room to Improve

  • 🐛 Glitches and bugs
  • 💰 Expensive premium subscription
  • 🔒 Limited functionality without premium
  • 🐛 Inconsistent rest timer
  • 🐛 Workout data loss

More Flex Fitness Training apps to explore

FAQ about Flex Fitness Training

What are the best flex fitness training apps for iPhone?
Flex AI Workout Trainer & Log tops our flex fitness training apps ranking as of October 2026, with a 4.6-star average from 2.4K App Store ratings, and it's free to download.
Yes — 20 of the top flex fitness training apps we rank are free to download, including Flex AI Workout Trainer & Log and Flex Studio LK.
Flex AI Workout Trainer & Log has no ads and offers in-app purchases, according to its App Store listing as of October 2026.
We track 250+ flex fitness training apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.