Five years ago, Bob McCormick couldn’t walk a short city block without having to sit down, the pain was so bad. But remarkably, after two hip replacements and knee surgery, he’s able to walk 20 miles a day. And that, unto itself would be an amazing story, were it not for the fact of what he’s doing now. In early August, Bob McCormick left—to walk—from Denver, Colorado, to Washington, D.C.—a distance of more than 1600 miles.