I looked at MyFiziq a while ago. The basic premise of their app and service is that they can conduct an accurate body scan, using your smartphone's camera and a bunch of algorithms calculate your body composition with a high degree of accuracy. While there are scales that can tell you your body-fat percentage or do can pay for a DEXA scan (figure on around $100 for each scan). MyFiziq gives comparable results. They've now signed a deal with Fitocracy, a huge health and fitness focussed social network, to offer their scanning tech as part of the on-boarding process for people looking to get fitter and track their progress.