One consequential change is that people used to get most of their calories at breakfast and midday, with only the evening top-up at suppertime. Now t… - Bill Bryson

The makers of sneakers also thoughtfully pocked the soles with numberless crevices, craters, chevrons, mazes, crop circles, and other rubbery hieroglyphs, so that when you stepped in a moist pile of dog shit, as you most assuredly did within three bounds of leaving the house, they provided additional absorbing hours of pastime while you cleaned them out with a stick, gagging quietly but oddly content.

"To tell you the truth, I'm amazed we've come this far," he said, and I agreed. We had hiked 500 miles, a million and a quarter steps, since setting off from Amicalola. We had grounds to be proud. We were real hikers now. We had shit in the woods and slept with bears. We had become, we would forever be, mountain men.

Now here’s a thought to consider. Every twenty minutes on the Appalachian Trail, Katz and I walked farther than the average American does in a week. For 93 percent of all trips outside the home, for whatever distance or whatever purpose, Americans now get in a car. On average the total walking of an American these days—that’s walking of all types: from car to office, from office to car, around the supermarket and shopping malls—adds up to 1.4 miles a week, barely 350 yards a day. That’s ridiculous.