This exercise not only strengthens the hamstrings, but also increases core strength and stability.
Begin by laying on your back, heels on the exercise ball, arms across your chest. Lift your hips off the ground so that your back and legs are aligned.
Slowly bend your knees, pulling the exercise ball towards you. Be sure to keep your buttocks off the ground, and maintain your balance. If you are having a hard time balancing at first, put your arms at your sides rather than across your chest.
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