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Begin by laying on the floor on your back, arms crossed over the chest, with your heels on the exercise ball. Lift your bum off the floor into a bridge position. Lift one leg towards the ceiling.Using the leg that it still on the exercise ball, slowly flex the hamstring, pulling the exercise in toward you. Hold for a few seconds, then extend your leg back to the starting position. Do about 5-10 reps of this to begin, and then switch legs.
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