Richard Stallman said, "My hobbies include affection, international folk dance, flying, cooking, physics, recorder, puns, science fiction fandom, and programming; I magically get paid for doing the last one."

I don't see how you could be an intelligent, creative person and only be fixated on one thing your entire life. The smartest people I know have all sorts of creative outlets. I think I saw something that said a very large portion of Nobel prize winners are musicians, too.

Personally, I exercise because if I don't my mood suffers. It's a big problem, which I have found a solution to. Don't judge people.