This is a very good question, one which I ask myself often. Yes, I like looking fit and in shape, but I think it is much more profound than that(or maybe not). I think it has to do with having a commitment to something for myself. Many times after working all day, I don't feel at all like going to gym. I have to get to my car, drive to the gym, change out of my work clothes(which for some reason I hate this process), and then get to my work out. And I have a time contraint cause I have to pick up kids right after the workout. But some how just making myself do it! feels good. I like the endorphins, the pain that feels good some how. I like that I do this for me! this is my thing. I like the routine. I don't completely know the answer to why I work out, but I know it is a part of who I am.