'Ball Crunch and Twist - Fitness Republic'
'Buy Stability Ball/Exercise Ball: http://www.fitnessrepublic.com/store/fitness-accessories/stability-ball-pump.html - For a ball crunch and twist; ; place both hands on the back of your head, for supporting your neck; settle down on a stability ball and then roll yourself off it, till the stability ball is only supporting your core; and your knees are making a 90 degree angle. Pull yourself up and twist your core to the right; press and hold; back to lying on the ball; press and hold. Pull yourself up and twist your core to the left; press and hold; back to lying on the ball; press and hold. And one ball crunch and twist is complete.'
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