Without a doubt, standing tables have become the mark of a hip office. Any self-respecting startup that claims to hold employees' well-being at the top of its priorities is hopping on this bandwagon. And large companies are jumping in too — including AOL, Google, Twitter and Facebook. Google offers standing desks as part of its employee-wellness program. That means that any employee looking out for his or her health can choose to work at a standing desk. (Some companies, by contrast, only offer them if a doctor writes a note saying it's medically necessary for a specific condition.) Facebook has more...