Instructions:

1. Start by lying face down on a stability ball with your feet shoulder-width apart and your toes touching the ground.
2. Place your hands behind your head or cross them over your chest.
3. Engage your core muscles and slowly lift your upper body off the ball, keeping your back straight.
4. Rotate your torso to one side, bringing your shoulder towards your hip. Keep your hips and legs stable throughout the movement.
5. Pause for a moment, then return to the starting position.
6. Repeat the rotation to the other side.
7. Continue alternating sides for the desired number of repetitions.