“Mmmm,” Amy Cragg, a marathoner competing in the Rio Olympics for the U.S., once tweeted about the chocolate raspberry flavor of GU (pronounced “goo”), an energy gel. “Tastes like frosting!” For Cragg ...

Flavor fatigue can spell impending doom for endurance athletes. The key to endurance sports is balancing the nutrition equation: energy, electrolytes and water consumed must match those used or ...