"The Health app, loaded onto all iPhones with iOS 8 and sitting prominently on the home screen, is clearly ambitious, but at the moment the majority of it's intended abilities remain inactive or useless (at least without additional third party sensors, which don't seem to exist yet). But for those with a new iPhone, the Health app can be useful right now, because it has the ability to track your steps like a pedometer, as well as flights of stairs climbed, and your walking / running distance.
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