The main purpose of hydration during exercise is to maintain optimal fluid balance in the body. Proper hydration helps regulate body temperature, lubricates joints, and supports overall physiological functions. During physical activity, the body loses fluids through perspiration, which can lead to dehydration if not properly addressed. Dehydration can impair performance, decrease endurance, and increase the risk of heat-related illnesses. Therefore, consuming adequate fluids before, during, and after exercise is essential for enhancing performance and promoting recovery.