Tae Kwon Do Bad for the Knees - Why?
I feel as though its pretty well known that Tae Kwon Do is bad for your knees. However, I'm not sure why this is well known (maybe a rumor that just spread very quickly and very far), nor am I sure why TKD is bad for the knees (if it is true). Awhile ago, I decided that it was because of the common practice in TKD schools of kicking the air, kicking as hard as you can with no resistance, which would put strain on the "stopper" joint, the knee.
Does anyone have any more solid information about this?