Hamstring Curl Pilates Ball
Great exercise for the hamstrings.
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Lie on the floor with your arms at your sides and place your heels on the ball.
Press up, so that your hips are in the air and your torso forms a straight line from your heels to your head.
Using the hamstring muscles, pull the ball toward you while maintaining your hips in the air.
Roll it back out to the starting position without dropping your hips.