Recently while surfing the net I came across this upper bod excersizer called the Powerball. It is just a small ball about the size of a tennis ball. It doesnt use batteries, but just Gyroscopic power which can travel up to over 13,000 RPMs generating almost 40 pounds of pressure on your arm. It supposedly "creates massive muscle burn" which rapidly increases muscle mass. Has anyone here tried it or know if it works? Please tell me your thoughts and comments.