10 Innovations That Changed the Way We Exercise

Courtesy Nike
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Nike+ iPod

This little sensor that fits in a Nike+ shoe (or that may be worn on a runner's own pair) enables tracking of performance indicators like speed and distance, as well as the ability to map a route. It relays information via a voice that becomes both pedometer and pace coach, providing real-time feedback and encouragement on the route. There's also the ability to select a "power song" for an extra boost. Users of the system can upload their workout information to the Web to track their progress and plan a training schedule. Users can also join an online running community, giving runners access to one of the most important tools of training: competition. —Jennifer Weiss