I've had knee pain for years. I had physical therapy a few years ago, and it has helped some; the PT said biking was excellent. The doc said I'd just have to put up with it until it was bad enough for a knee replacement. (yikes!) Losing weight helped some, but it still hurt to be on my feet more than a few minutes, and there was minor pain while bikeing. Then about a month ago, I started yoga classes twice a week, and trying some of the moves at home. The knee pain is gone! Or darned near. I don't know which of the many moves caused the miracle, but I'm grateful