Why do tennis player grunt when they hit the ball?

They act like it takes a great effort. You ever hit a tennis ball as hard as you can?

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SW-User

I read an article about that. Apparently grunting gives them more energy and boosts their performance.

chrisCA · M

@SW-User Much like the martial arts, or weight lifting.

SW-User

@chrisCA I think it applies to our everyday life as well. When you’re in pain, you grunt or groan. It’s a reflex, but it helps you tolerate the pain.