yep, it just depends on the reasons. i hate working out in gyms because i see so many people i know in school, and they never stop yapping at me. i relly just like going in and going out.
working out is both si and se, it just depends on your reasons. my main reason is that it alleveates my mild asthma, and makes me feel like a million bucks when i'm done. the rest like muscles n such are just secondary benefits. i really do it for the runner's high =)