This video from Business Insider reminded me of a post we did a few weeks ago on posture tips for a pain free workday. The video has 20 very good tips for sitting at your desk without hurting your back.
If you do have to sit, this video does a good job of showing you how to set your desk up for maximum comfort and productivity. And if you are able to look into an alternative workspace option, might I suggest the Hamster Wheel Desk.
Source: Business Insider