“I suffered a severe shoulder injury in a car accident and after surgery was told recovery would take a year. I started with therapy twice a week, but needed to be able to do some of the exercises at home. These worked great. I took them and showed them to my physical therapist so he could tell me which ones would match the weighted bands we use at the office. He told me the ratio and I was able to continue my rehab at home. I was told the injury would require a minimum of a year recovery with therapy; being able to actively do therapy at home (with permission of therapist, of course) has me already at about 80% at only the six month mark. They work just like the ones at the office, except mine are hooked to my door, not hooked to heavy machines. They have held up well!”–Karen,  amazon.com