When apps are driven by the market, there's only one winner. It's not you ...

They govern more and more of our lives and the information they accumulate is supposed to empower us. But it's the market that is the ultimate beneficiary America's three obsessions - technology, fitness and finance - have finally converged in FitCoin, a new app that allows users to monetise their visits to the gym. The mechanism is simple: by integrating with popular activity trackers and wearables, the app converts our heartbeats into a digital currency. FitCoin's founders hope that, much like...