You can play music during your Nike+ Training workouts. Simply close the Nike+ Training App, begin playing your music, and then reopen the Nike+ Training App. The music will play in the background. Any voiceover or sound in the Nike+ Training App will play in parallel to your music.
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.