This is an intermediate ball crunch exercise.
Sit straight up on the exercise ball, then walk your feet forward until your back is resting around the ball. Put both hands behind your head, and keep your elbows out. Your feet should both be flat on the floor.
Exhale and crunch forward, keeping your feet flat on the floor and your knees bent. Hold for 2 seconds and release. Repeat for continual reps.
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