SAVE YOUR KNEES DVD is a great complementary DVD for the work from Save Your Hips. This DVD focuses on maintaining your knee joints in good working order. In this step by step instructional DVD, you will learn how to build back healthy knee function and maintain it. This will allow you to do all the sports and fitness you love and avoid the breakdown often caused by repetitive movements into this joint. *This is a must for runners, cyclists, and dancers. If you think you are going to do any of these physical activities without knee damage you are wrong! Add in Save Your knees and you can keep doing what you love!!!!! Save Your Knees DVD. This DVD uses the silver ball and black balls. Product is not included.