Hydration is crucial for physical performance as it helps regulate body temperature, improves muscle function, and supports nutrient transport. Dehydration can lead to decreased endurance, increased fatigue, and impaired cognitive function. Maintaining proper fluid balance ensures optimal performance during workouts, supports recovery, and minimizes the risk of heat-related illnesses. Athletes must be mindful of their hydration levels before, during, and after exercise to enhance overall performance and avoid detrimental effects on physical and mental well-being.