Some grey area here for me!

In the past i would not have considered gaming a sport, even if it involved waggling the joystick like a crazy bastard to make Daley Thompson run faster during his Decathlon :)

But actually, that game made you sweat and was hard work, and so it does at least fill some of the definitions above. There are also those dance-off games and plenty of others that involve physical activity - I think that's where I have trouble with other (board/bored) games being a sport.

Interesting one though and I expect plenty of differing opinions :)