Using a Vuzix headset, a laptop, Arduino and a bike sensor, Aki Mimoto was able to rig up his wife's stationary bike to transport himself through a virtual Google Street View environment.
Of course, that means you wouldn't have to sit staring at a wall or a TV while exercising—you could virtually travel down roads anywhere in the world. Unfortunately, the design needs some tinkering to be really usable—but it's a fantastic concept that's really worth pursuing. If there was a commercial product that got this right, I would probably be all over it. Hit the following link to learn how to do something like this at home. [Bako via Make]