What is bridge with ball under legs?

Bridge with ball under legs

1. Lie on your back with your legs up, calves resting on the ball. For more challenge, rest your heels on the ball.
2. Look up at the ceiling, and keep your chin relaxed. You can place a small pillow under your head or neck for comfort.
3. With your arms by your side, press your hands onto the floor for stability.
4. Tighten your belly muscles by pulling your belly button in toward your spine.
5. Push your heels down toward the floor, squeeze your buttocks, and lift your hips off the floor until your shoulders, hips, and knees are all in a straight line.
6. Try to keep the ball steady. Hold for about 6 seconds. Keep breathing normally and don't hold your breath.
7. Slowly lower your hips back down to the floor.
8. Repeat 8 to 12 times.