Stretch more and eat bananas. Other than that I am not sure. It is not a normal biking thing so you probably stressed something. Are you doing toe-touch type stretches? Do those together and also one leg at a time. What part of the knee hurts? back? sides? under the kneecap?
Looks like I just upgraded to biking everyday. My car did not start this morning :P
So much for going to Chicago for the 4th... drat.
Uh... sides of knee hurt. I will work harder at the toe-touch stretches, I usually don't do much of that because it's embarrassing (I can't get near my toes, never have been able to).
Oh, dear! Got any clue what's wrong with the car?