Knee exercises at YogaEverywhere.com. Your interactive yoga portal with stretches, breathing exercises, yoga store, yoga retreats, ayurveda directory and yoga directory. A mindful approach to your physical, mental, emotional and spiritual well-being.
This page has a lot of stuff about yoga, with videos and so forth. It looks like a great resource. Right now, I'm adding the especially important (to me!) article re yoga for high blood pressure.