The purpose of hydration during exercise is to maintain proper bodily functions and performance levels. Staying hydrated helps regulate body temperature, lubricates joints, and transports essential nutrients throughout the body. Dehydration can lead to fatigue, decreased endurance, and increased risk of cramps or heat-related illnesses. Drinking water before, during, and after workouts replenishes lost fluids and supports recovery, ensuring individuals can perform optimally in their exercises.