The brain self regulates you in the heat when you are speeding up and if you go over that line you are done.
—Mark Cucuzzella, M.D.
An in-depth piece by Dr. Phil Maffetone on water intoxication and hyper-hydration is a must-read for all runners. I drank very little in the 80-degree Boston heat. Maybe just 12 ounces of water. What I did instead was constantly pour cups of water over my head and body and this helped to cool me down.