
Is Mark Anti-Running?
Mark Sisson · November 1, 2026
When I detail the potential adverse effects of what I call “chronic cardio,” I’m simply offering a word of caution and sensibility to the frenzied marketing messaging of the running boom that is often leading to injury, burnout and failed weight loss efforts. For devoted runners, consider an experiment for the next 30 days to replace about half of your weekly mileage with walking, keep the runs you truly enjoy, and pay attention to how you feel. Notice your energy through the day, how well you sleep, and how your joints feel when you get out of bed in the morning. I suspect you’ll discover what I did, that the body we were born with thrives on frequent, comfortable movement, and that lifelong fitness is far more enjoyable than the running boom led us to believe. Then decide for yourself how often you really need to run.
















































