Begin by lying flat on your back with your feet elevated on an exercise ball. Allow your arms to rest by your sides. Engage your abdominal muscles by drawing your belly button in toward your spine.
Using your glutes and hamstrings, gently raise your hips off the floor so that you are resting on your upper back and your body forms one straight line from head to toe.
On an exhale, bend your knees to bring your feet in towards your glutes, rolling the exercise ball closer to your body. Be sure to keep your feet together and your hips elevated.
On an inhale, extend your knees to return to the starting position. Make sure that your hips are elevated throughout this movement.