Interview: The Road to Sparta with Dean Karnazes

Do you know why we call our modern marathon a marathon? You may think you know the real story behind the very first marathon, but in this captivating, inspiring tale, Dean Karnazes (named by Men's Health as one of the 100 Fittest Men of All Time) gives us a deeper look at the man who, 2,500 years ago, ran the first ULTRAmarathon and, in doing so, effectively saved Western civilization. :) Big Ideas we explore: a history lesson The Battle of Marathon, why balance doesn't lead to happiness (and what does), a 24 Hour Fitness with Harvard profs, heroes are ready and how to play the pain game.