Hydration status profoundly influences athletic performance. Even mild dehydration can impair physical and cognitive functions, leading to reduced endurance, strength, and overall exercise capacity. Proper hydration is crucial for thermoregulation and cardiovascular function during exercise. Thirst should not be the sole indicator of hydration needs, as it may not manifest until dehydration has already occurred. Athletes should monitor their fluid intake and adjust based on factors such as temperature and exercise duration to ensure optimal performance and recovery.