Lay on the floor in a supine position. Place the stability ball under your legs
somewhere between your calf and heel. Your arms should remain at your side on the floor
slightly under your body to help control your position. Push your legs down into the ball
as you push your hips upward until your body has created a straight line. Hold at the top
and slowly lower your body back to the floor. Squeeze your hamstrings and glutes at the top
of the movement to increase intensity. The futher the stability ball is from the hips
the more difficult the exercise.
Hip Extension Hamstring Exercise - Start Position
Hip Extension Hamstring Exercise - Finish Position
Stability Ball Hip Extensions - Hamstring Exercise Video