1. some sports are fun to play for some people - just like people asking why shooting people in a game is fun
2. "exercise high" - they get "high" on the exercise they get from the sport. it's a weird feeling that is sort of like an adrenaline rush, i had it a few times before.
ninja: forget, watching?
edit: they like to take pride in the fact that they live in a town that has a winning team and that "they" are breeding good sports teams even though they have nothing to do with it. i find some sports fun to watch.