Let's face it: the quantified-self movement is all about strapping gadgets to your body and letting them tell you things that you already know. Aside from marathon-running gym worshippers, we're all keenly aware that we could be taking better care of ourselves. Of course, those fancy devices do offer a means to record your data in a way that makes it easy to track your progress, hopefully motivating you to concentrate on getting your activity graph to go up while your weight goes down. We're two or three generations into the market now, and the crude pedometers of yore have been replaced with units packed with altimeters and accelerometers that prom
