http://www.sixpackfactory.com : The one leg stability ball curl works the back of the upper leg, known as the hamstring. The specific muscles that are being targeted are the bicep femoris, semitendinosis and semimembranosis. To perform the one leg stability ball curl you must lie on your back with one leg straight and its foot resting on a ball and the other leg raised in the air. Raise your hips and bend your knee to pull the ball in towards your buttocks by contracting your hamstring muscles. Pause and slowly return to the start without dropping your hips. Breathe out as you stand upright and breathe in as you go down. For more ab exercises go to: http://www.sixpackfactory.com
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