Strava, the running app that helps make training social, is one of the first other than Nike to take full advantage of the iPhone 5S M7 coprocessor.
The M7 takes work from the main A7 processor to manage power more efficiently inside the iPhone 5S. Developers like Strava have the ability to tap into the M7's functionality, thanks to a set of CoreMotion APIs.
Apple says the new developer tools will lead to "better fitness and activity apps that go well beyond what other mobile devices offer". The M7 processor measures user motion data, even while the device is asleep, and saves battery life for pedometer or other fitness apps that use the accelerometer throughout the day.
This app, in version 3.5.3, takes advantage of the M7 to offer features like Auto-pause which will give better accuracy in your pace and feedback from intelligently knowing when you're stopped. And thanks to the new chip this app will let you run for longer before the battery dies because of more efficient power consumption.
Strava is a free app and can be downloaded from the iTunes Store.