Posture!

http://www.greatist.com/health/the-best-way-to-sit-at-a-desk/

check out this link on posture and the proper way to sit.  I've been reading in another book that sitting all day and the posture at your desk also effects your running form!  I constantly slouch at my desk and sit in weird positions.  I am making an effort to at least get up every 60-90 minutes and take a break - which also coincides with a bathroom break and refilling my water bottle.