Hydration plays a crucial role in muscle function by maintaining fluid balance, which is essential for optimal performance. Adequate hydration supports muscle contraction and helps transport nutrients to muscles during exercise. It prevents dehydration, which can lead to symptoms like cramping, fatigue, and decreased strength. Water also aids in regulating body temperature during physical activity, allowing for endurance and overall efficiency in performance. Consequently, staying properly hydrated before, during, and after exercise is vital for sustaining muscle function and overall fitness.