Now, here is something for those who want to exercise with a static bike, but want to spice it up a little bit. Instructables user braingram made this mod of a regular bicycle. He managed to interface his bicycle to a computer and navigate in Google Earth with it! A simple sensor from a bike odometer is used to detect the speed, and an thumb-joy controls the rotation. The electronics are controlled by an Arduino, interfaced to the PC with USB. Check out this video!