At the verge of turning forty, Peter Sagal—brainiac Harvard grad, short bald Jew with a disposition towards heft, and a sedentary star of public radio—started running seriously. And much to his own surprise, he kept going, faster and further, running fourteen marathons and logging tens of thousands of miles on roads, sidewalks, paths, and trails all over the United States and the world, including the 2013 Boston Marathon, where he crossed the finish line moments before the bombings.
In this n...