If you are loking to build more ab muscle, then you need to increase resistance. A Gazillion crunches with no resistance won't build that muscle like you want. Try an incline bench, do crunches with 5 or 10 lb held to your chest, try hanging crunches... any kind of resistance will help to build muscle. If it's too easy, you will get tone, at best.
Naxis
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Keep your body lean, your blood clean and your mind sharp. -Rollins
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