You need to be in proximity to your mobile device to maintain constant communication. We recommend staying within 10 feet of your device, but we've seen Nike+ Training used successfully with up to 40 feet proximity between athlete and device.
Note: The Nike+ Training App is no longer available for download in the iTunes App Store. If you are an existing user with the app already downloaded and installed, you can continue to use the app as you've done in the past. Be aware that if you have the Nike+ Training App installed and upgrade to iOS 8, you will no longer be able to use the app, as it isn't compatible with iOS 8. For more information, please click here.