crunch (on stability ball, arms straight)

Instructions

1. 1

   Step 1: Sit on the stability ball with your feet flat on the ground and your knees bent at a 90-degree angle.

2. 2

   Step 2: Lie back on the ball until your lower back is supported and your upper body is parallel to the floor.

3. 3

   Step 3: Place your hands behind your head or cross them over your chest.

4. 4

   Step 4: Engage your abs and lift your upper body off the ball, curling your shoulders towards your hips.

5. 5

   Step 5: Pause for a moment at the top, then slowly lower your upper body back down to the starting position.

6. 6

   Step 6: Repeat for the desired number of repetitions.