Hydration is crucial for maintaining body temperature, particularly during exercise. When the body heats up, sweat production increases to cool the skin, facilitating thermoregulation. Adequate fluid intake assists in maintaining blood volume and optimizing circulation, which is essential for heat dissipation. Dehydration can impair the body's ability to regulate temperature, leading to heat exhaustion or heat stroke during physical activity. Thus, maintaining proper hydration is vital for exercise performance and overall health, particularly in hot or humid conditions.