Long runs must be done. They are the backbone of any running program—from 5ks to ultramarathons. Long runs build endurance and strength and teach you all you need to know about handling and dealing with fatigue on the run. Long runs also help you develop mental toughness needed to tackle long distance races, like half-marathon, marathons and beyond. 10 Ways to Enjoy the Long Run Here are 10 ways to make going the distance comfortable—even a enjoyable ride.