A boxer and a chess player

One day a chess master at an interview talking about chess and sport, told his journalist friend that chess players work themselves up mentally and physically for hours on a daily basis.

His friend could not understand the physical side of the argument. Taking boxing as an analogy, the chess master made a comparison between a boxer and a chess player and said : "The boxer loses weight before his bout and a chess player after," adding that in the course of a hard tournament he usually lost several pounds weight !