What is the best exercise to strengthen knees?

[tanyajack]

Feel Good Knees System is a natural pain relief regime designed exclusively for men and women over the age of 45. While someone younger can definitely use this system, it is built with mobility and flexibility concerns in mind, concerns that are common the older you get. In other words, it’s rare to find someone over the age of 45 who can move like a 20-year-old. So, this program focuses on executing simple, gentle movements that are based on a 1000-year-old holistic ritual that was used to treat all types of pain and discomfort. There’s no need for a prescription medication, nor do you need a professional trainer or expensive equipment. With your own body weight, you can use Feel Good Knees System and start to gradually reduce pain, naturally and permanently.

http://www.youtube.com/watch?v=4aCA1BKkwKU