Joe De Sena is the co-founder of The Death Race, Spartan Race (1M+ competitors), and more.  Among other things, he has personally completed the famously grueling Iditarod dogsledding race...by FOOT.  What about the Badwater Ultramarathon, Vermont 100, and Lake Placid Ironman?  He did all of those in ONE WEEK.  The man is a maniac, but he's also strategic and tactical.  This episode covers his story, as well as his approaches to grit, endurance, and building empires.