Do you spend all day inside an office, sitting at a desk? It's time to break out of this sustained inertia; with intervals.
Replace snack intervals with workout intervals. Step out onto the stairs during breaks or just prior to lunch, and perform a handful of interval climbs (taking 2-3 steps at a time) up a few flights of stairs. Walk back down and repeat. Put spunk into your movement when going up the steps.
Start with a few intervals, but gradually build up to 6-8 intervals per break. Climb more than just a couple flights, too. Work up to a climb of five flights.
Do these while your coworkers are sitting around snacking on donuts and soda.