Before buying one, try it out. My nephew has a bad back and it made his worse. And if they are not hooked up properly you can have other problems. (I handled Workers' Compensation for 38 years and they came in and out of fashion over the years.) So be sure to go to a reputable place that will allow you to try it out first and they KNOW how to use it. Do you have "The Back Store" in your area? They used to supply them.