For me basically to look good and be healthy
but probably couldn't imagine a better feeling then having an ex of yours that dumped you and you aren't too fond of anymore suddenly want you back again after she sees how you look now :-D (of course you wouldn't get back with them but thats when you tell em to kiss your ass! :-P) lol that's just one of my reasons for working out thought you'd people find that the most interesting :-P