By
eHow Sports & Fitness Editor
Difficulty: Moderately Challenging
Step1
Take some time to become familiar with the exercise ball. Sit on it, roll around on it and get a good feel for it before using it for exercises.
Step2
Sit on the ball and get balanced. Walk the feet slowly away from the front of the ball engaging the abdominal muscles.
Step3
Rest the lower back on the ball as the feet walk down and away from the ball. Walk the feet out far enough to move the buttocks off the ball.
Step4
Bring the elbows up, pointing perpendicular and away from the body. Set the chin as though holding an apple under it.
Step5
Suck in the abs and crunch up. Find a focal point on the wall and look straight up for a count of 2 or longer. Lower slowly and repeat.
Step6
Do 3 to 4 sets of crunches. Start with 6 to 8 repetitions when beginning this exercise and work up to 8 to 10. Advance the workout with a more challenging 15 to 20 repetitions.