Walking definitely helps to relieve stress. When I was trucking and was waiting to get unloaded at a distribution depot we had to wait with our vehicles until called to back on a loading bay. This could take anything up to four hours. Used to drive me potty wasting so much time.
I often used to get out of the cab and walk around the whole thing, trailer and cab, over and over again. Ten, twenty, thirty, or more times. It did help. I could switch off from my surroundings, made me feel better knowing that I was actually doing something useful.
Parked up at night, I often went for a walk, wherever I was.
ilona