This is a great ball exercise to work the abdominal muscles.
Sitting on the floor, have the exercise ball resting between the legs about a foot off the ground. Lean your body back with your hands resting behind you, leaving only your buttocks and your hands on the floor.
Exhale and bring your knees inwards towards your chest. Hold for 2 seconds, and release for one rep. Repeat motion for continual reps.
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