Originally Posted by
austropithicus
Some yoga and pilates classes can really get the heart rate up. It just depends on what type of yoga the teacher prefers.
Check this guy out. Former U of Iowa wrestler, now a fitness guru that preaches body-weight exercises.
www.mattfurey.com
Any of the high energy yoga classes will use a bunch of poses that will stress an injured knee. Not sure about pilates. Swimming seems the best bet to me.