Hydration plays a crucial role in muscle performance by supporting muscle function and contraction. Inadequate hydration can lead to decreased strength, endurance, and overall exercise performance. Electrolytes, which help maintain the body's fluid balance, are also lost through sweat during exercise and must be replenished. Proper hydration aids in regulating body temperature and can prevent cramps and fatigue. Drinking adequate fluids before, during, and after physical activity is essential to maximizing muscle performance and overall exercise effectiveness.