Why do runners need to drink sports drinks that have sodium potassium?

Runners need to drink sports drinks containing sodium and potassium to replenish electrolytes lost through sweat during prolonged exercise. Sodium helps maintain fluid balance, while potassium supports muscle function and reduces the risk of cramping. These electrolytes are crucial for sustaining performance, preventing dehydration, and promoting efficient muscle contractions during endurance activities. Proper hydration with these electrolytes can enhance recovery and overall athletic performance.