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Form Guide:
– Rest your instep on top of the ball with your body in a straight line and your hands directly beneath your shoulders.
– Draw your knees in to your chest.
– As you drag the ball towards you, rotate your knees to one side.
– Try to avoid raising your backstep as you move the ball. Alternate sides with each rep.
Gym Ball Jackknife Twist form guide – Get a six-pack in six weeks: http://bit.ly/1e9CF7t
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