Here's how to move it, move it
“You may be stuck behind a desk for the majority of the work week. Here's how to move it, move it.”
Unless you're shackled to your chair, move when you can (and if you are shackled, you should seriously rethink your work environment). The more you can move the better. A recent study showed that people who fidget are generally thinner than those who aren't as wiggly. Even something as insignificant as tapping your foot can burn an additional 300+ calories. Take a pair of mini one pound weights to work and do bicep curls when you're on the phone. Get out of your seat. If you can do some of your work standing, do it. Take the stairs instead of the elevator and park farther away in the lot. Challenge yourself to find ways to burn more calories when you're not officially working out.