Hour 2: How can an athlete perform incredible feats of endurance, setting records all over the world eating only a plant-based diet? We’ll find out this hour with Scott Jurek, seven-time consecutive winner of the Western States 100-Mile Endurance Run and numerous other races. His new memoir is “Eat and Run: My Unlikely Journey to Ultramarathon Greatness” (Houghton Mifflin Harcourt, 2012).