How to Hydrate for a Race

The first thing to do is figure out your sweat rate. You want to try to prevent underhydration and over hydration, so you would like to stay above a 2% body mass loss. That's going to imply that you're going to need if you're serious about this,. And one of those things is how much you sweat. I personally carry a pack of many people do, but see people with handouts who only get food stops and these aren't very big help.