You Are an IronmanBy: Jacques Steinberg 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