Believe it or not sitting is hard work. There are several studies that have found that the average adult sits 14-16 hours per day. Employees are encouraged to move and change positions throughout the day to help combat the effects of prolonged static posture. Consider adjusting chair slightly throughout the day, alternate between sitting and standing, eating lunch standing up, have face-to-face conversations instead of sending a text message or email, or even get up and go from a stroll.
Benefits of Standing
Cornell University Sitting vs Standing
New York Times Article about effects of prolonged sitting