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  curtispenner

  

  

The stomach crunch has been a staple ab exercise for many years. But when done on an exercise ball, the effectiveness of the exercise is dramatically increased. You'll find this exercise not only works the abdominal muscles, but also works the legs and butt as you work to maintain your balance. Check out this free online exercise video to see exactly how it's done.

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Credits:	Curtis Penner
URL:	http://befitandstrong.com
Tags:	ab_exercises abs bicycle_crunch exercise free online videos

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