There are a lot of websites out there to tell you how to perform
abdominal crunches. This version over the exercise ball allows you to
work your abdominal muscles through a larger range of motion than on the
floor. Putting your arms over your head shifts your mass over the ball
forcing your abdominal muscles to work harder.
If your find this too difficult, go back and try
Ab crunches 1
Ab crunches 2
Repeat this ball exercise 6 times.
Repeat this ball exercise 10 times.
Repeat this ball exercise 15 times.
Return to the top of Ab Crunch 3