When Running Is Too Much of a Good Thing

Athletes consistently train hard to optimize performance. They follow an effective exercise program with rest and recovery days. In comparison, compulsive exercisers move their bodies for reasons other than to enhance athletic performance.

Why Dry Air and Altitude Drain Your Sodium Faster Than You Think

Colorado runners lose sodium two ways at once, and most training plans only account for one of them. Thin air pushes breathing rate and sweat rate up before the body has adjusted, and the state's low humidity evaporates sweat almost as fast as it forms, so a soaked shirt can hide how much salt…