How to do it

1. Sit on a Balance Ball and walk your feet forward until your lower back is supported by the ball.
2. Place your hands behind your head with elbows wide.
3. Engage your core and curl your torso toward your knees, lifting through your chest.
4. Slowly return to the starting position, controlling the movement.
5. Repeat for the desired number of reps, maintaining tension in the core.