Hydration levels critically affect athletic performance, as even minor dehydration can impair physical and cognitive functions. Adequate hydration helps maintain optimal blood volume, ensuring efficient delivery of oxygen and nutrients to muscles during exercise. Insufficient hydration can lead to decreased strength and endurance, increased fatigue, and impaired thermoregulation, raising the risk of heat-related illnesses. Staying well-hydrated also promotes better recovery post-exercise, allowing athletes to maintain consistent performance levels.