Directions
With your feet flat on the ball and your butt as close to the ball as possible, press down on the ball with your feet and lift your hips straight up. Squeeze your glutes and the back of your hamstrings and lower yourself down to the floor.
Using the ball is a challenge to your core to stabilize. You have the option to putting the ball up against a wall for a bit more stability, or putting your feet on a couch, kitchen chair, or even the wall.