A "New York Times" bestselling author takes readers inside the Ironman triathlon. As he did so masterfully in his "New York Times" bestseller, "The Gatekeepers, " Jacques Steinberg creates a compelling portrait of people obsessed with reaching a life-defining goal. In this instance, the target is an Ironman triathlon-a 2.4-mile open-water swim followed by a 112-mile bike ride, then finally a 26-mile marathon run, all of which must be completed in...