BOSU Ball Kneeling Ab Crunch
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Step 1

Place a Bosu Ball on the floor in front of you, ball-side up. Position both your knees on the ball with your hands on the floor beneath you for support.
Step 2

Lift and extend your right leg behind you, reaching your heel back and up toward the ceiling.
Step 3

At the same time, raise your left arm off the floor and extend it out in front of you. Pull your left elbow and right knee together and repeat.
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