Spark bikes, shown here, were developed by Silicon Valley start-up Expresso Fitness. The stationary bike includes virtual-reality software and a Web-based tracking system so that two riders can race each other on the same 3D course. Cyclists must steer their stationary bike in order to stay on the virtual-reality road, and if a course goes uphill, gears will naturally tighten.
The machine also tracks cyclists' heart rate, speed, elevation and calories burned. Players can plug in their iPods, too.
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