Lie faceup with your calves on top of a stability ball, arms by your sides, and palms down. Squeeze your glutes and raise your hips until your body forms a straight line from shoulders to heels. Bend your knees to roll the ball toward you until your feet are flat on the ball. Straighten your legs to roll the ball back, then lower your body to the floor. That's one rep.
3A: Stability-Ball Hamstring Curl
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