Hydration significantly affects physical performance, especially in hot conditions. In high temperatures, the body loses water and electrolytes through sweat, which can lead to dehydration, impaired performance, and heat-related illnesses. Proper hydration helps maintain blood volume, ensuring optimal circulation and temperature regulation during exercise. Individuals should drink fluids before, during, and after exertion, adjusting their intake based on activity intensity and duration. Staying adequately hydrated enhances endurance, cognitive function, and overall physical abilities, particularly in challenging environmental conditions.