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Best Flex Fitness Training Apps

250+ iOS apps curated and reviewed

4.7 avg rating
20 free apps
Updated September 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 (September 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Flex AI Workout Trainer & LogFlex AI Workout Trainer & LogFree4.6★ (2.4K)NoYesSep 2026
2Fitplan®: Gym & Home WorkoutsFitplan®: Gym & Home WorkoutsFree4.8★ (11K)NoYesSep 2026
3Macrofit FitnessMacrofit FitnessFree4.5★ (5.8K)NoYesSep 2026
4Flex Studio LKFlex Studio LKFree——NoMay 2026
5Stretch Plus FlexStretch Plus FlexFree—NoNoSep 2026
6Flexx Strength TrainingFlexx Strength TrainingFree—YesNoMay 2026
7Flexfit Training CenterFlexfit Training CenterFree—NoNoMay 2026
8Flexx Personal TrainingFlexx Personal TrainingFree—NoNoMay 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
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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
Fitplan®: Gym & Home Workouts#2

Fitplan®: Gym & Home Workouts by MVMNT Inc.

#1 Personal Trainer App
Strong Contender
💪 Health & Fitness
4.8😐(11K ratings)
FreeIn-App Purchases
Fitplan®: Gym & Home Workouts screenshot 1
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Fitplan®: Gym & Home Workouts screenshot 5
Fitplan®: Gym & Home Workouts screenshot 6

Access personalized workout plans from elite trainers, whether you're at home or in the gym. Track your progress, get step-by-step video guidance, and join a supportive community to achieve your fitness goals.

What We Love

  • 🚀 Great variety of workouts
  • 👍 Easy to follow workouts
  • 👍 Keeps you motivated
  • 👍 Helpful instructional videos
  • 👍 Tracks progress and weights
  • 👍 Affordable compared to personal trainer

Room to Improve

  • 🐛 App crashes and freezes
  • 🐛 Bugs with saving workouts and progress
  • 🐛 Videos not loading properly
  • 🐛 Unreliable timers and tracking
  • 🐛 Lack of customization and flexibility
  • 🐛 Frequent app updates with new issues
Macrofit Fitness#3

Macrofit Fitness by MacroFit Inc

The Fitness App
Worth Considering
💪 Health & Fitness
4.5😐(5.8K ratings)
FreeIn-App Purchases
Macrofit Fitness screenshot 1
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Macrofit Fitness screenshot 5

Access diverse fitness and sport-specific training programs led by professional athletes and trainers. Includes curated nutrition options, macro tracking, and workout logging to help you achieve your fitness goals.

What We Love

  • 🚀 Great content and programming
  • 👍 Clear and intuitive interface
  • 🤸‍♂️ Effective and challenging workouts
  • 🎯 Structured programs with progression

Room to Improve

  • 🐛 Buggy app with frequent crashes and freezes
  • 🔍 Difficult to navigate and find workouts
  • 🔇 Lack of audio/music during workouts
  • 🔄 Inability to pause, reset, or track progress
  • 💸 Expensive subscription with limited free features

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 September 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 Fitplan®: Gym & Home Workouts.
Flex AI Workout Trainer & Log has no ads and offers in-app purchases, according to its App Store listing as of September 2026.
We track 250+ flex fitness training apps on the iOS App Store as of September 2026, ranked by rating, recency, and analysis of real user reviews.
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.
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.