[Evans, Marv]

I'd go with Stomachmonkey's advice. As I understand it, it can be bad for people who have not attained full growth and whose bones have stopped growing. I know I have Osgood Slater's (sp.?) disease. That is caused by being overactive as a little kid, and the excessive tension on the knee bone causes it to not develop properly preventing the top of the bone from properly growing up under the kneecap. At least that's the way it was explained to me a long time ago.