I am a true believer that you can do all the crunches you want, but if you do not remove the excess fat that covers them you wont see them. CARDIO, CARDIO, CARDIO! However, abs still have to be trained. I do 3 sets of 12 in the roman chair, then 3 sets of crunches on the flr. Once I get home, I do bicycles for 3 sets of 12. Is this sufficient?