How to do: Ball Plank Pikes
Lie on a stability ball on your stomach, with your feet touching the floor behind the ball. Lean forward until you touch the floor with your hands and continue to walk them forward until the ball is at your shins. Make sure your shoulders are directly above your wrists and you are in a plank position. With straight legs, lift your hips high to the ceiling then gently return back to plank.
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