Re: Boxers and urine
Just a thought but have you ever thought about the fact that you are drinking too much water? If you have to drink that much you might want to talk to a doctor.
Back to the original question I think that as many people have said its a combination of nerves and just sweating it out. I am a tri-athlete and race sprint and Olympic distances and never had to use the restroom while racing and those last upwards of 3 hrs for an Olympic. I also think it has to do with the fact that you just aren't thinking about it. When someone is trying to beat the shit out you, you aren't really thinking about using the restroom.