Hydration is critical to athletic performance as it regulates body temperature, maintains electrolyte balance, and supports muscle function. Adequate hydration before, during, and after exercise prevents dehydration, which can lead to fatigue, reduced coordination, and impaired decision-making. It also optimizes cardiovascular function, enhancing endurance and physical output. Athletes should assess their hydration levels, especially in hot conditions or during intense workouts, to ensure that performance is not compromised.