Imagine the back problems you’d have it you were standing most of every day. Especially if you are over 30.
Actually, you’d probably have fewer, as you would tend to build musculature that would help support the back.
Standing in one spot is awful, I can’t do it for more than a few short minutes, walking at even the slowest speed or just shifting around a little is much better than just standing still. Standing still can cause a person to lose consciousness if they stand still enough. Ask anyone who has been in the military and had to stand in his tracks for long periods.