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Swiss Ball Jackknifes

Posted by GymAmerica
Tuesday, April 3, 2012 at 5:39pm filed under Abdominals

Calories Burned:  306 calories per hour   (based on a body weight of 150 lbs.)
Primary Muscles Trained:  Obliques
Get into a pushup position with the tops of your feet resting on a stability ball, your body forming a straight line from toes to shoulders. Keep your back straight as you contract your abs and roll the ball toward you.

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