A professional chess player can burn up to 560 calories in a two hour game.

This is almost the same as what you would spend running 8 km. Where did the data come from: at one of the chess festivals, the organizers connected devices to Russian grandmaster Mikhail Antipov that measured the player’s heart rate and breathing rate. So they found out that it was exactly so many calories that he burned in a couple of hours of the game. No wonder chess players are called athletes. And it seems that soon they will overtake footballers in popularity.