Open question about physiology

Over the last week or so I have been performing a different duty than normal while at work. Mostly involving standing around a lot while tending to the cash register. What I don’t understand is why this makes my legs and lower back hurt so bad. And hurt it does.

Why is it that I can stand on my feet for six, eight, or even ten hours at a time, while throwing heavy boxes (60-80lbs.) around with no ill effects, yet when I am forced to stand and work in a smaller area it just kills me? I know that I usually walk at least a couple of miles per day, under normal circumstances, and I do throw a lot of heavy shit around. So do my back and legs ache from lack of stress/impact? That seems completely opposite to the way it should happen.

Seriously, is it the lack of motion that makes my joints hurt or what? Is it kind of like starting your car on a cold morning; no lubrication of moving parts for a few minutes? All the stop and go moving adds up? I simply don’t understand why I can carry heavy stuff around for eight hours or longer, yet, when I have to stand still for minutes at a time, over the same length of time, it hurts my back.

I need to dispose of this body and try to develop an exoskeleton. I will probably keep this body until I have the exoskeleton working though…

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