Anyway, getting back "on piste", the ancient board game of chess is a reconised sport of the International Olympic Committee. Not only that, there are calls for it to classified as an extreme sport. At a recent tournament, there were 2 deaths attributed to high stress levels caused by playing the game. These must have been the unfit ones, as in order to be at your peak, you need to be both mentally and physically at the top of your game. It as been suggested that you can loose the same weight during a game of chess than a game of football!
http://www.theguardian.com/commentisfree/2014/aug/16/chess-extreme-sportChange of clothing? Definitely; technical sports gear to combat excessive perspiration. A shower after? Oh yes, a cold one preferably!