Nike and Apple on Tuesday introduced the US$29 Nike+iPod Sport Kit, a receiver/sensor combination that works with compatible Nike footwear to deliver real-time audible feedback to an iPod nano while the user exercises. Time, distance, calories burned, and pace are stored on the iPod and displayed on its screen, as well as spoken through the headphones.

After working out, users connect the MP3 player to their computer and automatically sync and store data in a customized log on the Nike Web site. When setting up their playlists, users can select a Power Song that will be activated when they press the iPod nano's center button. The idea is that the Power Song will give them the extra boost they need to complete their workout.

Nike's new $100 Air Zoom Moire shoes are the first ones to work with the Sport Kit, which was unveiled today at a New York City press event attended by Nike CEO Mark Parker, Apple CEO Steve Jobs, seven-time Tour de France champion Lance Armstrong and marathon world record-holder Paula Radcliffe. The new products will be available in stores July 13.

"We're working with Nike to take music and sport to a new level," Mr. Jobs said in a press release. "The result is like having a personal coach or training partner motivating you every step of your workout."

Nike has launched a new Web site, nikeplus.com, to promote the products, and the iTunes Music Store is offering a Nike Sport Music section. In addition to an iPod nano and compatible footwear, the Sport Kit requires a Mac or Windows computer with a USB 2.0 port and iTunes 6.0.5. Mac OS X v10.3.9 or Windows 2000, XP Home, or XP Professional is also required.