\"Run until you can\"t run anymore. Then run some more. Find a new source of energy and will. Then run even faster.\" The words of Scott Jurek, a dominant force - and darling - in the gruelling and growing sport of ultrarunning for more than a decade....

2,200 miles. 47 days. One remarkable journey. In July 2015, ultramarathon legend Scott Jurek smashed the world record for running the Appalachian Trail, the sprawling mountain path that runs nearly the entire length of the United States. For nearly seven weeks straight, Jurek battled the elements to run, hike and stumble 50 miles every single day....