The best, cheapest, most democratic, most possibly natural exercise (maximally antifragile): a high-dimentional (daily) walk. No two steps will ever be the same. No smooth surfaces. You concentrate naturally. No music. No shoes that fit like a cast and prevent you from “feeling” the terrain (vibrams, instead). You do better going fast, in a state of exhilaration, than going slowly, particularly when you run downhill. Best of all, you don’t know you are walking. I am lucky to have found a mile long round trip stetch. Best of all, your body weight drops like a stone…

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