American ultramarathon runner Dean Karnazes on this episode of Holding Court with Patrick McEnroe

Named by TIME magazine as one of the “100 Most Influential People in the World,” Dean Karnazes has pushed his body and mind to inconceivable limits. Among his many accomplishments, he has run 50 marathons, in all 50 US states, in 50 consecutive days. He’s run across Death Valley in the middle of summer, and he’s run a marathon to the South Pole.On ten separate occasions he’s run a 200-mile relay race solo, racing alongside teams of twelve. His list of competitive achievements include winning ...