Desidiousness. Lat. sitting too much; slothfulness, idleness, carelessness. – A New Dictionary of the English Language by Charles Richardson, 1836

Reginald was nearly all day at his office, and half the night at his stand-up desk in his room. – Henry Kingsley, “Reginald Hetherege,” 1874

Workers at home who have aching backs and but one writing desk, and that a low one, will find great relief from writing in a standing position (if a recess is out the question), if only for fifteen minutes. My standing desk is a broad mantel shelf. – B.G.A., “Helpful Hints and Suggestions,” in The Writer, August 1887

Sitting is the new smoking. – Health catchphrase, c.2009