I can remember, back in 1944, my dad bringing an electric motor home from work, fastening it on the wall in the brick garage we had and attaching a broad leather belt which must have been on eccentric mounts on the shaft because when he put it round him and switched it on the belt vibrated alarmingly. I have to report that it didn't last long, I'm not sure why but it soon vanished.
I think this is just one of a long list of 'exercise regimes' using mechanical means and the basis of all of them is that they do not require individual effort which after all, as I understand it, is the base of all effective physical exercise. You might as well believe that riding on a bus is equivalent to walking that distance!
I'd like to say that this was now Flatley dryer country but humans can be so lazy. I wouldn't mind betting that the modern equivalent exists.....