I remember the days when my job pretty much mandated that I sit at a desk all day long. It was difficult then and is even more difficult now to add activity during the working hours without looking like a slacker in your job.
The things I want to add to the list that you have already gotten is to make it a practice to stand during every telephone call unless you truly need to take notes throughout the entire call. There are also stationary mini bikes that literally slide under your desk. They are not made for the ages, but at a price under $30, they almost qualify for a stocking stuffer. Here is a link to one of them. http://www.sears.com/shc/s/p_10153_12605_00648162000P?sid=IDx01192011x00…