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Form Guide:
– Touch your fingers to your temples and lean back as far as you can on the ball.
– contract your abs to curl your chest towards your knees, keeping your lower back in control of the ball.
– Pause at the top for a second to squeeze your abs, then lower slowly to the start.
Gym Ball Crunch form guide – Get a six-pack in six weeks: http://bit.ly/1e9CF7t
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