During a conference on obesity in Bainbridge Island, Wash., a couple of years ago, the organizers invited Jack LaLanne to come before us Saturday night and be interviewed for our benefit, after which he accepted questions from the audience. (The story I wrote for the Associated Press is here, at my other, former blog.)

To start the session off, our host showed this video, which prompted a sustained, full-throated ovation from the attendees: