Rubber Bands builds resistance band workouts around the bands you own. It picks the band and reps for every set, and tells you when to move up.
Add your bands once. Every workout after that is built from them.
THE BAND AND REPS FOR EVERY SET
• Each exercise comes with the band to use and the reps to hit, matched to your level and your goal
• Automatic mode builds a workout from the muscle groups you pick and the bands you have
• Build your own workouts too, or start from routines like Push/Pull/Lower and Upper/Lower
KNOW WHEN TO MOVE UP
• Progression reads your recent sessions of each exercise
• Hit the top of your rep range in two of your last three sessions, and it suggests the next band up
• When the next band is too big a jump, it can suggest stacking two bands instead…
From the developer’s store description.