iTunes 
Use Nike + iPod with your iPod or iPhone
You can use iTunes to view workout data from Nike + iPod (available on iPod nano, iPod touch 3rd generation or later, or iPhone 3GS or later, sensor sold separately). To view and analyze your complete workout history, you can use iTunes to send your workout data to nikeplus.com.
After you sign up for a free nike.com account, your workout data can be sent automatically to the website, where you can track your progress over time, set and monitor goals, compare your results with others, and compete with other nikeplus.com users.
You can store workout data for a Nike + sensor in separate nike.com accounts, or you can assign multiple sensors to the same account. By default, each sensor is named Sensor 1, Sensor 2, and so on. You can rename them (for example, “Running,” “Cross-trainers,” and so on) so that you can easily identify sets of workout data.
Send your workout data to nikeplus.com
Complete one or more workouts using your Nike+ shoes and a Nike + iPod receiver.
Connect your iPod to your computer and select your device.
Click the Nike + iPod button.
Select “Automatically send workout data to Nike+.”
If you don’t have a nike.com account, click Create Nike Account and follow the onscreen instructions.
Rename a sensor
Connect your iPod to your computer and select your device.
Click the Nike + iPod button.
Choose Edit from the Sensor menu.
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In the window that appears, type the new name.
For more information about calibrating the sensor, see the documentation that came with your Nike + iPod Sport Kit or read this article:
You can create a new account at any time at nike.com. You might want more than one account if, for example, other family members share a Nike + iPod.
Tip: Sending your workout data to nikeplus.com ensures that your workout history is accessible even if you need to restore your iPod.