I saw this device the poweriser (some spell it powerizer).
Now this looks like fun, and I would buy one but I know what the wife would say. She would say "you better get off that before you hurt yourself" then wham! I would hurt myself.
Back in 1999 I was roller blading, I had just finished and was getting ready to come to the house to take them off when my wife says "you better stop before you get hurt". Well do you see where this is going? Right after she says that I slip and fall. Now falling would not be so bad in and of itself, however I threw my left arm back to catch myself. Now that is not bad either. However when your feet are above your head it is bad. So I dislocate my shoulder the bone is sticking threw my shirt as if I had stuck a 3 inch pencil straight up from my shoulder pointing up in my shirt. So I go to the ER and they knock me out to get my shoulder back in place. I was out for all of 30 seconds and when I woke up, I jumped up and started singing in the ER. Go figure.
I am seriously thinking of getting this device. I will have to be careful unlike the time I was cutting tree branches in a tree with a circular saw and wearing cowboy boots :)