Why do tennis players scream when trading balls?

Tennis fans often question the motivation of players to shout during their ball exchanges with their competitors.

In fact, the usual is not limited to the players, the tennis players emit sounds during matches, especially the Spanish star Rafael Nadal, the former world number one, and the latter claims that since 39, he has grown up, he pays with this cry and is part of it Change the pattern of his shot now, while some players justify the subject as part of their respiratory system when paying, and that they do not breathe well when paying, only with screaming.

Studies have shown that shouting increases the strength of the ball, adjusts the payout time, as well as the confidence, relaxation and ability of the player to control the game.
Some players and players have reached levels of noise that cause competitors to lose concentration, some have complained about this situation and have been straightened. The referee now has the power to punish the player or players he believes that his screams were exaggerated during the payment. The goal is to influence and distract the opponent.