Hydration plays a critical role in temperature regulation, especially during physical activity. Proper fluid intake helps to maintain body temperature by allowing sweat to evaporate, which cools the skin. Dehydration can impair the body's ability to effectively regulate its internal temperature, leading to heat-related illnesses. Staying well-hydrated aids in maintaining optimal performance, enhances endurance, and minimizes the risk of heat exhaustion or heat stroke during physical exertion.