Why do tennis players grunt?
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Answer: Forceful exhalation can accompany stronger muscle activation during a shot
Forceful exhalation can accompany stronger muscle activation during a shot ✓ — Forceful exhalation and grunting can accompany greater muscle activation and force in tennis stroke experiments. Bracing and coordinating effort are plausible contributors, but this does not mean every player gains a fixed percentage of power.
The sound replaces the need to use the trunk muscles — Making a sound does not replace the muscles needed to stabilize the trunk. A grunt accompanies physical effort rather than doing the muscular work by itself.
The sound adds forward force directly to the ball — The sound wave is not what propels the tennis ball. The racket transfers force to the ball, while a grunt may accompany the player’s forceful effort.