It wasn’t that long ago that a water closet scale was the only gadget you needed to track weight loss. Today even videogame consoles, once the bane of the fitness industry, are trying to help you recycle that spare tire, and of course there’s no shortage of specialty doo-dads getting in on the action. The Fitbit is one of those, a tiny accelerometer that pledges to keep an eye on what you do so that you can just go ahead and do it, reporting back at the end of the day on how well you did at staying active. It sounds nice, but it’s not quite that self-sufficient. Read on to see if it’s worth the commitment.