This $499 magic mirror could make you fitter than ever

Anyone who's ever tried to lose more than a few pounds knows the harsh raw power of the bathroom mirror and the bathroom scales. For some of us, weighing in every day and looking at ourselves naked is all the motivation we need to hit the gym and eat better. 

For others, however, it can be the opposite — because it can provide a distorted picture of how well your new diet and exercise routine is working for you. Build muscle and you'll be healthier, for example, but you may also weigh a little more. A mirror can't show how your body is changing on the inside.