Apple Nike + iPod User Manual

You can change your music during a workout without losing your workout data. 
Your workout is paused while the music changes.

iPod nano (5th generation or earlier):  Press the Menu button and choose Change Music. 
Your workout pauses.
iPhone 3GS, iPhone 4, iPod touch, and iPod nano (6th generation):  Tap Pause, then tap 
Change Music. If the device is locked, first press the Home button and drag the slider 
to unlock it. If the iPod nano (6th generation) screen is off, press the Sleep/Wake button 
to wake it.

iPod nano (5th generation or earlier):  Choose new music. Your workout resumes 
automatically.
iPhone 3GS, iPhone 4, iPod touch, and iPod nano (6th generation):  Choose new music. 
Tap the top of the music screen to return to your workout, then tap Play.

You can set iTunes to automatically send your workout data to nikeplus.com over the 
Internet whenever you connect your device to your computer. You can also send your 
workouts wirelessly to the nikeplus.com using iPhone 3GS, iPhone 4, or iPod touch.

Make sure your computer is connected to the Internet, and then connect iPod nano, 
iPhone 3GS, iPhone 4, or iPod touch to your computer.

Open iTunes on your computer, click the Nike + iPod tab, then select “Automatically 
send workout data to nikeplus.com.”