Of course you can. Stretching is not just great fun, it’s great for you. Prolonged sitting is about the worst thing you can do, right up there with smoking or being overweight. So you need to move more and when you do get up from your chair, you should take that opportunity to have a quick stretch.

I found this great article that outlines a series of stretches you can do at your desk using your chair as a prop to stretch almost any part of the body. Check it out by clicking this link.