Why do Tennis players makes funny noises..

[yenrod]

When they play

If I ever will play it do I know that I'm 'in the zone' when I make funny noises..

 

[tyred]

I dunno but have often wondered that myself.

 

[montage]

I used to play tennis to a pretty high standard..... the harder I hit, the more I grunted (though no screaming...)....so I guess it is the same as doing a rep of something in the gym....it helps.

 

[accountantpete]

I expect their coach has told them that it helps expel CO2 - breathlessness can be caused by having too much CO2 in the bloodstream rather than a lack of oxygen.

 

[montage]

Or to do with the fact that when you grunt the core muscles seem to contract a tad...which could lead to better place/more powerful shots.