I do, there is not a day goes by that i can rest and do completely nothing at all. The thoughts behind what drive me mostly are "i must do this to keep in good shape" even though i really don't need to... it's just how i think. Then once i have done whatever i feel i needed to, i get an enormous amount of satisfaction and good sense of well being from it, even if it's just been a good few sets of pushups and leg raises for example.
Suppose one way to look at it would be that it's not a bad addiction to have
