Hydration levels significantly affect physical performance, as even mild dehydration can impair endurance, strength, and cognitive ability. Maintaining adequate fluid intake helps regulate body temperature, supports nutrient transport, and maintains cardiovascular function during exercise. Dehydration can lead to fatigue, decreased coordination, and increased risk of cramps or heat-related illnesses. Athletes must prioritize hydration before, during, and after workouts to optimize performance and recovery, as fluid balance plays a crucial role in overall physical effectiveness.