Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A sports drink is a beverage designed to help athletes rehydrate, as well as restore electrolytes, carbohydrates, and other nutrients, which can be depleted after training or competition. Electrolyte replacement promotes proper rehydration, which is important in delaying the onset of fatigue during exercise. As the primary fuel utilized by exercising muscle, carbohydrates are important in maintaining exercise and sport performance.