Relatedly, I'm convinced that humans cannot achieve any form of peak performance in any domain (athletics, art, business, community organizing) without consistently going for walks. We're all aware of the programmer working at a problem for hours, going for a walk, sitting down, and then elegantly solving the problem in a few lines of thoughtful code (haven't we all experienced this?), and here is an example in another domain...

I have never been at my best rock climbing performance without a substantial amount of walking; even if I am training well, eating well, sleeping well, climbing with others, and super enthusiastic, the element of walking is for some reason critical.

My suspicion is that the human body is designed for walking (eg, we are upright, our shoulders adapted to swing the arm) and that myriad processes simply will not occur or will not occur optimally without walking. I believe restoration on a cellular level is enhanced by walking, that various cognitive and sub-cognitive processes are aided by walking, and that many of these processes sync up with a sort of supermodular (https://en.wikipedia.org/wiki/Supermodular_function) effect when walking.