Actually, I can honestly say that I love working out. It helps regulate my sleep and moods, a lot of my workouts are focused around skills like martial arts, so I'm learning new things while I do it, and to be quite honest, this xkcd says it all:
I didn't get into working out until I started treating it like the geek activity it always wanted to be. Biology, anatomy, physics, math, it's all there.
I always wonder how high school would have been different if Phys Ed. had been as challenging of a class intellectually as any other science.