walking means exercise, walking means effort, you and i have to do something to keep ourselves spiritually awake, going back to our illustration again about the car driver on the motorway, you find yourself after so many miles just dozing off because the road is so straight, not much traffic around, not much to think about apart from the countryside that goes by and you're there foot on the accelerator, no braking, no gear changing, nothing at all and you get to the point where you're driving one-handed by the thing, that's the time when you get so relaxed isn't it?