Having an inflatable ball would also be preferable to a chair, but I don't think it's as good as standing (I suggest it for those without adjustable desks.) Something like this might be better
http://www.officecha...ball-chair.html, but from personal experience standing is more energizing than the balls. Even better though is walking constantly during work:
http://www.engadget....ll-workstation/ http://www.trekdesk.com/ The doctor advocating it is also selling it with a price tag of $500 plus the treadmill, so skepticism is warranted, but I think most people would agree that they sit too much at work (assuming an office job.) Maybe if the price comes down more offices will use it. Standing or inflatable balls seem like a cheap solution to the slow rot of our bodies/minds/spirits from sitting all day. JLL's suggestion is the best if you are a superhuman
And for andcodotal evidence, I'll refer to a partial Office Space quote, "Michael, we don't have a lot of time on this earth! We weren't meant to spend it this way. Human beings were not meant to sit in little cubicles staring at computer screens all day, filling out useless forms and listening to eight different bosses drone on about about mission statements."