The Nike+iPod Sport Kit, which will be available in two months at $29, has already won an endorsement from Tour de France champion Lance Armstrong, who plans to run his first New York marathon later this year.

"It will take working out to a whole other level," said Armstrong, who appeared at the companies' news conference in New York City.

The co-branded kit comes with a sensor that fits inside compatible Nike footwear — sold separately — and a wireless receiver that attaches to the iPod.

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