If you think about it, treadmills are kind of weird: you walk or run but never go anywhere ... So Alex Astilean of SpeedFit decided that he'll remedy that paradox.
Behold the first human-powered mobile treadmill ... and boy does it boogie down the road!: Link (embedded YouTube clip) - Thanks Marilyn!
This one: http://tinyurl.com/2s3jtq