Our expert for this episode is legendary ultramarathoner Dean Karnazes. Dean provides insights into the mindset he uses to overcome extreme physical and mental challenges. To illustrate his approach, he also shares excerpts from his latest book, The Road to Sparta, which chronicles his experiences running one of the world’s most difficult ultramarathon events: The Spartathlon—a grueling 153-mile run from Athens to Sparta.

“There are two ways to cope with pain. One is to put your head down and grunt through it. I don’t know the other way”