Crunch (On Stability Ball, Arms Straight)

How To

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 cross them over your chest.

4. 4

   Engage your abs and lift your upper body off the ball, curling your shoulders towards your hips.

5. 5

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

6. 6

   Repeat for the desired number of repetitions.