Exercises for Gamers: Abdominal Crunch, Feet Supported
By Dr. Matthew Hwu, PT, DPT, OCS, CSCS··Updated
Quick answer
Feet-supported crunches strengthen the abdominals, which are often weak from sitting with the lower back arched. Lie on your back with your legs resting on your chair, then bend forward from your trunk to sit up. If a full sit-up is hard, do a partial movement with your hands behind your head.
The post suggests 3 sets of 10 repetitions.

Exercise: Feet Supported Sit-Ups/Crunches
Frequency and Duration: 3x10
Ah the good ol’ sit-up. Our abdominals are often weak from sitting in the extended position.
Start on your back with your legs supported by the chair and bend forward from your trunk to sit-up. If this is difficult for you perform partial motion with your hands behind your head. Perform 10 repetitions
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