very interesting subject ergonomics. First IMO, which may not be of any help, I think you have to consider your body. If you don't have any issues with your body and you don't want one, you have to find the correct position to have your body at it's correct posture. And that may not be the proper way to say it, but you know the WII game where you stand and it tells you if you are properly in balance, well I guess that's what I mean, you have to properly have your body in line and balance no mater if it's standing or sitting. According to research, our bones and vertebrates start to loose many factors. Mine unfortunately lost many due to wear and tare. But standing puts less pressure on my back then sitting, however, any professional will tell you that when you are doing repeative motions in one position