http://AskTheTrainer.com/stability-ball-exercises.html
Personal Trainer Michael Behnken, MS, NASM-CPT-PES, CSCS
Stability ball crunches are what makes the stability ball worth the money you pay for it.
The number 1 thing to not do, is move the ball while you do crunches.
To increase the difficulty of the stability ball crunch you should just move your hips up towards the top of the ball.
With your hands behind your head, this should provide more than enough resistance to get a great abdominal contraction.
Make sure you not only crunch your abdominals (rectus abdominis), but draw in your core (transverse abdominis).
There are many ways to modify the stability ball crunch, but make sure to use correct form and master this standard version first.
Neither this crunch nor any core or abs exercise will get you the elusive 6pack abs or six pack washboard stomach alone.
If you have excess fat around your mid section you should learn all about it.
http://AskTheTrainer.com/all-about-body-fat.html
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