Speaking from experience, when you go for a run and someone considerably older—who’s slow running and doesn’t look like they’ve put much time into their fitness—passes you without appearing to make a significant effort, it’s a confronting moment. Running slowly is something I find embarrassing. I know I shouldn’t feel that way, and I don’t want to, but I do.
Talking about the power of slow running—the fashionable phrase is sexy pace—with two people who really know about the…

