Prone Jackknife
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Added on March 6, 2008 mtnhiker08
Assume the push-up position with your shins on swiss ball and your hands flat on the floor. Use your abdominals to draw your knees in toward your chest, allowing your hips to rise toward the ceiling and your head to tilt towards the floor. Continue until your toes are on the ball, then return to the starting position.
Muscle Groups: Abdominals
