There are many reasons to engage in a regular exercise program. The most common, of course, is to look better in a dress or suit, in a bikini or board shorts, or (even better) naked.
Once you come to the conclusion that changing your appearance is your primary exercise goal, you need to make sure that your training program is structured accordingly. My latest article is an introduction to a series of articles dedicated to training for body composition, which means losing fat and gaining lean muscle mass. Check it out!