I have not heard of this yet but I could just picture myself trying it. I wouldn't be able to get up and move for several days afterwards, my spine tends to rebel against such things.
Of course, since it is shaped like an S, I guess that makes sense.
I have seen this advertised ,but it looks very physical.as for myself,I am gonna have to start out with light excercise,such as walking,and then progress to something more physical,being so outa shape,i don't wanna overdo it.