Use a medicine ball. Put one foot in front of the other, and squat down quickly before exploding the ball up as high as you can. Do not catch the ball on the return, let it fall to the floor. Repeat on both sides.
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Use a medicine ball. Put one foot in front of the other, and squat down quickly before exploding the ball up as high as you can. Do not catch the ball on the return, let it fall to the floor. Repeat on both sides.