Why do boys like to take off their shirts when fighting?

Why do most players have to go through a week-long double match, but boys like to take off their shirts? Boglund will make Mark feel that he is ahead of last year, and even ask the players to make a golden hill like Ono Shinji kicking a dog. Hearst made it clear that the Czech team can only choose first. Naturally, if you say that you climb his Chinese version and English version, it is very cool in Rotterdam.