How to perform it

1. 1

   Sit on the stability ball with your feet flat on the ground and your knees bent at a 90-degree angle.

2. 2

   Lie back on the ball until your lower back is supported and your upper body is parallel to the floor.

3. 3

   Place your hands behind your head or across your chest.

4. 4

   Engage your abs and lift your upper body towards your knees, curling your torso forward.

5. 5

   Pause for a moment at the top of the movement, then slowly lower your upper body back down to the starting position.

6. 6

   Repeat for the desired number of repetitions.

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