Possible upsides: Running on a rubber mat rather than cement or concrete. Downsides: Completely unnecessary. Possible safety risks depending on the speed you b

Possible upsides: Running on a rubber mat rather than cement or concrete. Downsides: Completely unnecessary. Possible safety risks depending on the speed you build up going downhill or through normal use and then falling off the back somehow. Completely unnecessary. But the other thing is that the video has no voice track to try and sell it. We have no pitch in this video and therein lies their major problem. Maybe they do have other benefits we don't know about. Maybe there is a medical case for this sort of thing. I'm no fitness expert, so I would be willing to hear them out, but it sure looks ludicrous. Though, riding that thing down a hill has to be rather fun. If not horrifyingly scary.