Ive noticed that people with six packs have all different kinds. Some pop out alot, some a little, some almost none, and Im not sure how people decide which ones to get. Does it depend on your stomach size, or the type of exercises you do? Also, I heard once you put muscle over fat its almost impossible to lose the fat, is this true? I know for sure I want one, and I think I want the one that doesnt really pop out. I guess what im trying to figure out is if I want that type do I need to make my stomach flat first, then put on the muscle, or should I start putting on the muscle now.