While I work standing, I wouldn't ever say that I work "standing still." I'm constantly shifting my weight across one foot or the other, shifting my upper body

While I work standing, I wouldn't ever say that I work "standing still." I'm constantly shifting my weight across one foot or the other, shifting my upper body slightly, etc... And if you can't stand for more than 20 minutes, I'd check over your posture. There really is a "right" way to hold yourself, and I haven't found many people (in our desk-conditioned culture) who fall into it naturally.