has been studying questions like this for more than 20 years, in between running 58 marathons (with a 2:37 PB) and ultra-marathons. He is also a doctor of public health and a professor of exercise science at Appalachian State University in the USA. I
crashed. He now believes he did too many hard 20-milers in the heat. "I was exhausted from the first step of the marathon," he says. He finished 15th in 2:14:19.HydrationEveryone knows drinking fluids is supposed to help you run faster. But you have
