This year I don't want to sit down so much. I want to stand. I heard that is a healthy thing to do. So, for my column in De Volkskrant (also on Blendle, both in Dutch) I made myself a little box that shouts "Get off your ass!" when I sit down for longer than 20 seconds. Ideal for at work. Although I have to remember to switch it off for the first meeting of the year...
See the video below for the box in action. I wrote this instructable if you want to build it yourself.