Like most of us, Dean Karnazes has found it easier to run a 200-mile race alone rather than trading off with teammates. And he celebrated his 30th birthday the traditional way—by running 30 miles. Okay, okay, those things are fun to say, but Dean Karnazes is a rare specimen who makes his living by testing his limits in ultramarathons and then sharing insights in inspiring books and talks. The Spaniard learned of Dean through his brother Scott, and that makes this discussion all the more special.