Why do footballers spit so much?

I have this argument with my GF, yes it's disgusting but when you're running around and getting a dry throat it just seems a natural reaction. Hard to explain it convincingly unless you are in that situation I guess.

I doubt any player does it to make themselves look 'cool', unlike chav kids you see spitting every 5 yards they walk.
 
Possibly, I'm not totally convinced by that argument though.
Me neither. I think people are sometimes given all the credit of a bunch of morons who do whatever they see the pro's do.

Build up of saliva is natural, it has to go somewhere, who would actually want to swallow it?
 
I'll just add that often you will see long distance runners spitting for the same reason, footballers only get stick for it because they are 'seen' more on TV.
 
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