The role of hydration in thermoregulation during exercise is essential for maintaining optimal body temperature. Proper hydration allows for the efficient dissipation of heat generated during physical activity through processes like sweat production. When dehydrated, the body's ability to cool itself diminishes, which can lead to overheating, decreased performance, and increased risk of heat-related illnesses. Staying hydrated ensures optimal blood circulation and nutrient delivery to muscles, contributing to overall exercise performance and safety.