rest is key for abs.. a lot of people train their abs 6 or even 7 times per week then cry when they dont develop.. They may harden up a bit, but if you want them to be defined (raise up) You must stimulate them accordingly. I think that a safe system for working your abs is this:
3 days per week with 1 day rest inbetween.
4 sets per workout.
no more than 12-15 reps. Sure anyone can do 100-200 situps, but if you want to stimulate your larger type IIb fibers you must apply large amounts of stress in small doses rather than go for high frequency. As Phreak said, abs are just like other muscles and will be overtrained with those idiotic 200 situps before bed crap.. SO, go for no more than 15 reps.
HOW? add resistance. Hold a 45 on your chest if you have to, and control the tempo.. Dont bounce up your crunches.. It should not be easy. For example while doing crunches, Fire up into the crunch position (not necessarily high, but your abs are contracted) and hold that static for a few seconds, then slowly.. SLOWLY lower yourself down. I mean so slowly that you feel like crying and the lactic acid build up makes you feel like your abs are going to ignite

For many, having a controlled tempo alone will be enough to limit their rep range. Do your crunches like that. If you are consistent and have a low enough body fat, I guarantee this will yield results. Apply the stress and let it rest baby
azndragon said:
still... 10% body fat is actually still pretty high to have a 6 pack... you need to bring it down to like 8 or 7 % i think
bf% is just a percentage. 10% body fat on someone who is a buck 20 is not the same as 10% doby fat on someone pushing 200.. know what i mean?
generally 10% is when people 'start' to see abs, but it is all relative to their overall body mass (weight, lbm AND where they carry their fat)..