AI Workout Generation
Your on-demand personal trainer.
Get fully personalized workouts crafted by AI based on your training history, recovery, goals, and performance. No templates. No guesswork. Just the right workout, every day.
“Lex, start a quick upper body workout for my hotel room.”
“Lex, I have a back injury. Please update my workout.”
“Lex, make me a push-pull-legs routine that fits into my school schedule.”
Ask Lex
It listens. It learns. You lift.
“I only have dumbbells and resistance bands—what’s the best hypertrophy plan?”
“Make my next pull workout harder, but keep it under 45 minutes.”
“My lower back hurts during deadlifts—what am I doing wrong?”
“Explain why progressive overload matters in simple terms.”
“How can I improve my overhead mobility for shoulder press?”
“Make me a weekly routine for the bulking season.”
Advanced AI Progression
Progress faster.
Easier. Smarter.
Progressive overload is the cornerstone of muscle growth, and Flex AI handles it for you. Enable Auto Progression for any exercise to automatically increase weight or reps based on your results.
Share Workouts & Activities
Fitness is better together.
Share workouts, celebrate progress, and fuel your motivation with real lifters worldwide. Flex isn’t just an app. It’s your crew.
More to love
Flex Leaderboards
Earn your spot. Inspire the squad.
Routine Importer
Bring your spreadsheet to life—just one snap.
Flex Challenges
Your grind, rewarded.
Muscle Recovery Tracker
Because growth happens after the grind.
Custom Exercise
Built by you. Tracked by Flex.
Apple Watch Integration
Log sets directly from your wrist.
Plate Calculator
No math. Just muscle.
