Darrell’s style of training is full immersion: He doesn’t ask anybody to do anything that he doesn’t do. Over the next year, he ran every mile, jumped every rope, lifted every weight, sparred as many rounds—every moment of training, right by my side. He ate when I ate; he slept when I slept; he worked when I worked. Often, he would quote Edgar Guest’s poem “The Sermons We See”: I’d rather see a sermon than hear one any day; I’d rather one should walk with me than merely tell the way. The eye’s a better pupil and more willing than the ear, Fine counsel is confusing, but example’s always clear …