Thank you, Department of Redundancies Department
From a website explaining various types of knee injuries:
The reason runners develop runner’s knee is because of the nature of running.
Awesome.
I never would have guessed that running might cause people who run (as opposed to people who play the trombone) to get a condition called runner’s knee. Next they are going to say Tennis Elbow often occurs in people who play tennis.

grey horse matters says 3 June 2010
Wonder if there is something called ‘biker’s butt’ from riding bikes? The powers that be spend so much money on nonsense don’t they. I once read a study that was done on why children fall off their tricycles…duh, it’s because they tip over was the conclusion.