Whatever it is, clearly sitting 8+ hours in a chair is no healthy way to live. You don’t have to ask what our ancestors did. You can see it in our bodies. What does a healthy body take? Something on the order of 3-4 days a week of intense exercise. Seeing past 20 feet from time to time to avoid eye strain. Getting sufficient sleep. Time to relax to let stress blow off. Simple, obvious truths, but few of us actually live them with the pressures of modern society.
I’m more triggered by someone using a weak argument that is in support of something I also support. The amount of direct empirical evidence for the health benefits of walking is so huge that we shouldn’t relay on the evolutionary argument, which is often associated with scams and pseudo-science.
Furthermore I’m saying that even if there was a very solid evolutionary argument for a specific human health behavior, it would answer the question “what helped humans 50k years ago reproduce”, instead of “how can I live a healthy life in the 21st century.”