Last winter and spring, after my wife unexpectedly took our car and left me for another man, I began to walk. I hadn’t walked for a long, long time. In recent years, my walking had been reduced to bathroom treks from the couch (and back!) and from my table to the bar, to demand booze when the service was too slow. I did pace up and down the classroom when I taught – probably the most walking I did all day. Too bad, then, that three of my four classes were online. They say a healthy, fit person should take 10,000 steps a day. By that estimation, I should be long dead.