From archaeologists to office workers, people feel the need to accompany hard work with a grunt. But why do they do it?
When the umpire at Wimbledon calls out “quiet, please”, a religious hush falls over the court. The only things that break the silence are the gentle pop of a bouncing tennis ball, the faint murmur of the crowd, and the passionate grunting of the players.
Related: What can science tell us about grunting in tennis?