reverse hyper extension (on stability ball)

Lie face down on a stability ball with your hips resting on the ball and your legs extended straight behind you. Place your hands on the ground in front of you for stability. Engaging your glutes and hamstrings, lift your legs up towards the ceiling as high as you can. Pause for a moment at the top, then slowly lower your legs back down to the starting position. Repeat for the desired number of repetitions.