2. Alternating push-up on a medicine ball

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Core, chest 

Position yourself in a push-up position, placing one hand on top of the medicine ball and the other hand on the floor, slightly wider than shoulder-width. The arm that has the hand on the ball should be slightly bent. Perform a push-up by lowering your body down. As you straighten up, rapidly roll the ball under your body to the other hand, then perform another push-up again. Repeat this sequence for as many as you can in the recommended amount of work time.

NEXT: Glute bridge