I'm 17, I've never had any kind of leg or knee injury, but this is really annoying. When I kneel down, or come up from a kneel, i have serious snapping/popping/cracking in BOTH my knee's. Sometimes it hurts, other times it doesn't hurt at all. What do you think it is? Anything I can do? Here is what thy sound like, sry about the TV in the background. I knelt down, then up, then down again a few times. - http://media.putfile.com/knee-pop note: this isn't BS, serious answers only please. i can provide a video if you don't believe me, but all you will see is a hairy/skinny leg going up and down, with popping noises.