[Nendoroid]

Though crunches do work your stomach area, it actually doesn't kill as much fat as running. There are several layers of fat, which I should have payed attention to in class; however there are fats you can burn by running and fats you can't. Same goes to every fat, doing just crunches won't cut it. You have to do more than one exercise to lose weight. Doing only crunches will allow you to lose weight, but you won't look any different on the outside, you're building back muscle and killing a few fat layers underneath your top layers of fat on your stomach.