If you live in in the heart of a city, it's hard to enjoy biking outside... not unless you like weaving through traffic. IMAX might have the next best thing, though. It's testing IMAXShift, an indoor cycling experience that promises to be more interesting than pedaling at the gym. The effort ultimately amounts to a cycling class in front of a giant screen, but IMAX argues that this could be a big motivator -- instead of riding either indoors or in a dreary urban landscape, you can travel along the Hawaiian coast or through the Solar System. There are even promises of "music-reactive visuals."