The most effective drink for rehydration during intense exercise is typically an electrolyte-rich beverage. Water alone may not suffice due to the loss of essential electrolytes through sweat during prolonged physical activity. Sports drinks that contain sodium, potassium, and carbohydrates can replenish lost electrolytes and provide quick energy, thus enhancing performance and sustaining stamina. Ensuring proper hydration before, during, and after workouts is essential in preventing dehydration and maintaining optimal physical function during exercise.