We are meant to walk. Sample size one, but I increased my walking from from maybe two miles per day to about seven miles a day about two years ago and essentially everything in my life has improved. There are so many benefits but if you choose your routes wisely, it allows for a kind of mental improvisation that is hard to do when sitting down. You can't write anything down, so you are forced to allow your thoughts to wander. This creates a kind of harmony because both you and your thoughts are in motion. Unfortunately most American towns and cities are indifferent at best and hostile at worst to walking, but I sense that this may change over the coming decades.