It was that time when everything seems hopeless, when to go on seems futile, and when a small act of kindness, another step, a sip of water, can make you realize that nothing is futile, that going on—especially when going on seems so foolish—is the most meaningful thing in the world. Many runners have encountered that type of crystalline vision at the end of a race, or training run, that brings with it utter fatigue and blessed exhaustion. For ultrarunners, the vision is a given.

