I'm guessing everyone has experienced this. You go skating (or really do any physical activity) on a hot day. Even though you might be drinking a lot of water, you don't piss much, or at all. You're just sweating it all out. Then, this has also happened to me. You need to pee before you start skating. But for whatever reason you don't. Maybe you're street skating and just can't find a good place. Whatever. So you just start skating. And the urge to pee goes away.
This got me pondering. Should you purposely go skate with a full bladder in order to keep hydrated?