This is one of the more difficult ball exercises that works the abdominal muscles.
Lying on the floor, have your legs extended straight up with the ball between your feet. Arms should be resting at your sides, head resting on the floor.
Inhale and move legs down towards the floor to form a 120 degree angle. Hold for 2 seconds.
Exhale, and extend your legs back up and over your head. Hold for 2 seconds, inhale, and return to start position for one rep.
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