I don't know, did I really say that it's incongruous with stress? I believe I had been talking about mortal danger. Do you see tight rope walkers checking their phones? Base jumpers, rock climbers, deck hands on a fishing trawler, firemen in a burning building, cops during a traffic stop, any other people during genuinely dangerous situation?

And yes, walking is not stressful for most people, that's the point of my first reply in this thread. There are people that find being outside as stressful as you find driving if not more, it's a real condition called agoraphobia. It's silly to pretend everyone is affected by such a condition though and trying to rationalize this is not strengthening such an argument IMHO.