Despite a recent report that a daily workout improves the productivity of workers, it’s just not possible for everyone to get out of the office, even for a quick 45-minute session. Fortunately, fitness guru Marina has found a way for us to slip a workout right into the office, although it may not go undetected. Marina’s series of Sitting to the Beat podcasts encourages us to tighten, loosen, wiggle and squirm our way to better health, not to mention a much livelier office environment. They can be downloaded to an iPod, or played through a desktop. Should you choose option number two, earphones are recommended.