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		| Originally posted by Did you just call me Coltrane? I know you're kidding, but you're not going to blow out your knee running.  Soccer, tennis, hoops, football maybe, b/c they require lateral movement.  I think it's a common misconception that running is bad for the knees.  Even M.D.s say this, and I think they're wrong (but I'm no doctor).  I had major knee surgery at 17 and my knees couldn't be stronger.  If you make sure you have decent form and try to avoid cement, your knees should be fine...
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 But, a person can develop some impossibly painful stress fractures.