I don't know your age, but what works for you now may not work for you as you get older. And many people exercise not because of how it makes them look but because of how it makes them feel; in fact, for many people who exercise, their appearance changes very little, if at all. And some people find that exercise helps mitigate chronic illnesses such as MS, hypertension, depression, asthma. . .or at least the symptoms thereof.