Sure, you get a pretty good workout on that regular treadmill, but don't you think you could burn more calories if you had a little directional freedom? Well, thanks to the ridiculously clever people at Virtual Space Devices, you're one step closer to breaking free of your staid workout -- and one step closer to fully immersive virtual environments. The Michigan-based company has been developing an omni-directional treadmill since 1996, and they appear to have come up with a real solution -- a self-contained unit which allows you to walk (or run) in any direction you choose, without actually covering any ground. Next up the company plans to manufacture a device called the iPlane, which will not only allow you to walk and run wherever you want, but fly as well, which should make future iterations of Doom really, really interesting. Watch the video after the break and be stunned and amazed.