How to Do a Stability Ball Crunch with Medicine Ball
This core exercise is a terrific way to strengthen the midsection. You'll need a stability ball and a medicine ball for this abdominal crunch.
Step 1
Assume start position as shown by lying on floor and placing feet on stability ball.
Advertisement

Step 2
Lift medicine ball up and out towards or past knees.
Step 3
Make sure to lift head, neck, and shoulders off of the floor.