Here's a terrific article and podcast from CBC's "The Current" about the latest research concerning the dangers of too much sitting in office situations, and some of the measures being used to alleviate them.
http://www.cbc.ca/radio/thecurrent/sitting-too-long-is-making-us-sick-how-to-combat-sitting-disease-sept-24-2013-1.1868071?autoplay=true

Who would have thought working at the office could be this much fun?

 In today’s chair-based world, sitting has become the new smoking. Dr. Levine argues that the heart of the problem is the way our modern world forces us to sit in nearly every aspect of our lives. Drawing on decades of research conducted in his Mayo Clinic lab, Dr. Levine will reveal the effects sitting has on our bodies and minds and more.