South--I was very skeptical, also. But my back told me to try something other than surgery, chiro, drugs, and such. I ordered a set, and quickly realized there was real science involved in the product's design and function. I've lived a fairly athletic and physical life, and my 50+ yr old body feels it. The Body Blade really loosens me up in the morn. I still lift weights, bike, treadmill, and so on, but this is a piece of equipment/ workout strategy I will not do without. Both my wife and daughter (in a wheelchair) over the years have had physical therapy. They came home a couple of times telling me what their Physical Therapists had them working with--the Body Blade. Sorry about the length... Anybody can use it at whatever "energy level" they want. There is a small learning curve, but within a day or two, you'll be showing off to your friends. Peace!