For years, health advocates have been telling us to move more. But just how much more?
A multitude of activity tracking devices now promise to answer that question. Generally, these digital monitors, which can be worn around the wrist, on collars and belts, even as jewelry, record how and how much you move throughout the day. Some aim to do a great deal more. Makers of the devices have begun intensive campaigns aimed at convincing the large population of worried well consumers to get wired and start recording their every move.