2. Believe it or not, doing crunches will not give you the results youve wanted to see so much. The problem is, working on a relatively small area of the body is kind of a waste of time. Also, you are putting so much effort into doing crunches, but they will not lead you to those great, rock hard abs you dreamed about. So instead of doing crunches for your abs, work on your core. You can begin by using a balance ball and doing sit-ups.