New marketing has launched coconut water into to the mainstream, but it’s actually been around for ages as a way to rehydrate rapidly. “In World War II, they used coconut water instead when they ran out of IV fluids,” says Alan Kipping-Ruane, a USAT coach and official. Reaching for this thirst-quencher post-workout can restore electrolytes, potassium, and sodium lost through sweating. Zico Coconut water—which packs more potassium than a banana in every bottle; 15 times more than the average sports drink—has recently started sponsoring triathletes including Greg Bennett, and Laurel and Rebeccah Wassner. Not crazy about coconuts? Chocolate milk is another idea recovery drink.