Standing good for the back Vinyl?
Let me steal Fred's term.
That's because you're still a pup. Give it another twenty years.
Standing still? No.
I have heard more reports of moving being better for the back than NOT moving.
Another thing that I have learned and tried and seen to work is, if you MUST stand, and it IS possible, then stand with one foot on something elevated, about as high as a step.
I am sure that this is not the same for everybody ALL of the time.
But I shall let you know in twenty years.