Just as George Plimpton had his proverbial cup of coffee in the NFL as the un-recruited and certainly unwanted fourth-string quarterback for the Detroit Lions, so, too, did Will McGough immerse himself in a sport he had no business trying. Like Plimpton, whose football folly turned into the bestselling Paper Lion, travel and outdoor writer McGough writes of his participation in, around, and over the course of one of the world's premier triathlons,...