Olympic viewers have noticed many puzzling athlete behaviors as the Tokyo games continue this summer.
Another odd practice you may have noticed happens amongswimmers, who slap themselves before a race.
So you’ll see people go up and down their arms and across their chest."

This explains why during a quick, pre-race warm up,swimmersare slapping their bodies.
Indeed,NPRconfirms the practice assists in getting a swimmer’s blood flowing before a race.
