Here's an excelent article on the dangers of sitting and the importance of activity. 
http://www.economist.com/news/science-a ... ing-orders
An excellent book on the subject is Sitting Kills, Moving Heals by for NASA scientist, Joan Vernikos.  She also has some informative videos on Youtube.
			
			
									
									
						The dangers of sitting too much
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				i-try-2-b-fit
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- ShootingStar
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Hourly 5-minute walks 'reverse arterial damage caused by sitting'
http://www.medicalnewstoday.com/articles/282194.php
			
			
									
									
						The harm to leg arteries caused by sitting for hours can be easily reversed with hourly 5-minute walks, according to new research published in Medicine & Science in Sports & Exercise, the official journal of the American College of Sports Medicine.
http://www.medicalnewstoday.com/articles/282194.php

 Well, I do ride my recumbent exercise bike and move around on breaks. All we can do is all we can do huh.
  Well, I do ride my recumbent exercise bike and move around on breaks. All we can do is all we can do huh.