For years, it seemed, runners couldn't get enough to drink. They carried fluids as they ran, stashed bottles along the road for long runs, and threw back multiple cups at every aid station during races. Then a few high-profile cases of hyponatremia (overhydration and a diluting of blood-sodium levels), including a young woman who died during the 2002 Boston Marathon, struck fear in the hearts of guzzlers. Click here to read more.

Have a Drink? Choosing the right mix of liquid and carbs will help fuel every run

It's 70 degrees, and you're heading out for a 10-miler. What should you grab. Water, sports drink, or maybe a drink with a shot of something extra, like caffeine? Click here to read more.

Fluid Replacement during Exercise 

Previous research has found that even low levels of dehydration may impair high intensity exercise performance on hot days. Higher volumes of fluid replacement have proven advantageous for runners and cyclists under these conditions. Click here to read more.