I know someone who had surgery and for several months afterwards he wasn't allowed to sit. He could stand and lay down, but sitting wasn't allowed for proper he

I know someone who had surgery and for several months afterwards he wasn't allowed to sit. He could stand and lay down, but sitting wasn't allowed for proper healing. Someone else I know had some kind of nerve problem in the back of her legs and she preferred to stand unless she was going to sit for a long period of time. I guess constant standing/sitting motion aggravated it.