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Does grunting add speed to a tennis shot?

Can a grunt add speed? In 10 Division I players, grunted groundstrokes averaged 83.4 vs 80.3 km/h, up 3.8%; serve speed rose 4.9%. Oxygen use and perceived effort did not differ significantly. The groundstroke study was small and collegiate, so treat the result cautiously.

Roger Federer executing a forehand stroke on a grass court

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