If you build it, they will come. This applies to Apple's new iPhone hardware the M7 coprocessor assists the powerful A7 processor. Nike + app takes advantage of the M7 coprocessor and new CoreMotion APIs in iOS 7, allowing it to track more reliable and accurate movement data in the background, even when the phone is asleep, while also conserving battery life. Great for users who are invested in the Nike + suite of products. Nike + is free.