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Do a jackknife with a stability ball

How to do a jackknife with a stability ball Do a jackknife with a stability ball. Get into the pushup position with the tops of your feet resting on a Swiss ball and your body forming a straight line from toes to shoulders. Keep your back straight as you contract your abs and roll the ball towards you.

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How to do a jackknife with a stability ball

Fitness • Exercise Equipment

Do a jackknife with a stability ball. Get into the pushup position with the tops of your feet resting on a Swiss ball and your body forming a straight line from toes to shoulders. Keep your back straight as you contract your abs and roll the ball towards you.

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Length 0:40