My daughter suggested this dvd for all around health. I also had arthroscopic knee surgery. This yoga practice which I do 3-4 times a week is terrific for strength in all areas of the body. I especially wanted something for strength in my knee. It has not disappointed so far. It has made a difference for when I bike, walk or play tennis. I can feel the strength in my legs and knees. I am nearing 60 so I need all the help with strength and bone density. I use to use it from ROKU, but decided to buy a dvd to make it easier to put on and to travel with.