"Voilà, the treadmill desk. I’m not sure where or how I first heard about the contraption, but I found out that several people I knew had one. In fact, I learned that two of my Fitbit friends whose step counts were astronomical were working at treadmill desks, so suddenly those numbers made sense. Multitasking! Still, I dithered; I had seen so many treadmills at garage sales, barely broken in. Would I be adding another? This seemed different, though. A treadmill at my desk wouldn’t require time set aside to use it, because it would be part of my everyday life."