[coopr]

Hmm, seems like this writeup is missing the vital recommendation that you have a foot rest and alternate between elevating one foot, elevating the other foot, and having both feet on the floor. I've tried working standing up without a footrest and found it intolerable after a short time, but with alternating feet height I can work standing for extended periods of time - and me feet/knees/back are happier than when I work seated.