In a year with two new iPhones, explaining all of the reason why you opted for the 64-bit, motion co-processor packed 5S over the cheaper but functional 5C to non-nerds can be a bit trying. The improved camera and flashy fingerprint scanner are easy to understand, but aren’t necessarily phone-sellers. For me, the M7 motion co-processor–which tracks accelerometer data in the background without spinning up the main processor–seemed like the reason to own the phone. It’s essentially a Fitbit built right in; of course, there was no way to tap into that potential without an app that took advantage of it. Surely every fitness app on the App Store will pack M7 features by next iPhone season, but for now, we get Argus. read more…