Sit on the floor like you did for the side-to-side slam and place the ball in between your ankles, holding onto it with just your legs. Reach your arms towards your feet, balancing on your buns. Keep your abs tight and shift your weight to the right, trying to lift your left 'cheek' slightly off the floor (your knees will turn a little as you rock). Quickly rock onto your left cheek, and lift the right. That’s one rep. Repeat as quickly as you can (without losing your balance) 20 times in a row.
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Get a fast and effective total-body workout with this training tool
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