Sports drinks are drinks that help athletes and active people rehydrate and replenish electrolytes lost during exercise. They are designed to improve performance and delay fatigue. How they work Hydration: Sports drinks help prevent dehydration, which can impair performance. Electrolytes: Sports drinks contain electrolytes like sodium and potassium, which help muscles function properly. Energy: Sports drinks contain carbohydrates (sugar) to provide an immediate energy source.