Electrolytes such as sodium, potassium, and magnesium are crucial for maintaining hydration and enabling muscle function during exercise. They help regulate nerve impulses, muscle contractions, and fluid balance, which are essential during physical activity. Loss of electrolytes through sweat can lead to muscle cramps, weakness, and decreased performance. Proper replenishment through sports drinks or electrolyte supplements is important during prolonged or intense workouts. Balancing electrolytes improves endurance and ensures optimal physiological function, reducing the risk of adverse effects.