Yes! You need to be able to push yourself beyond your comfort zone. And there's no better way to do that than by running long distances—like marathons. Here's why: -You'll burn more calories than other types of exercise -You'll build up your endurance and stamina, which will help you be more active throughout the day -It improves your cardiovascular system so that it can better handle other forms of physical activity without putting too much strain on your heart or lungs