Quote Originally Posted by Biking Mama
I do like a bit of tension while riding...what is spinning?
If you are pushing high gears, that could very well be the cause of your knee pain.

Here's a description of pushing vs. spinning from Sheldon Brown's web site (at http://www.sheldonbrown.com/gears.html
"Pushing" a high gear at a slow cadence is like power lifting. It is good for building up muscle mass and bulking up your legs, but it does little for your heart or lungs, and you can hurt yourself if you overdo it.

"Spinning" a lower gear at a rapid cadence is more like swimming. The rapid motion, with many repetitions makes the legs supple and flexible, it is highly aerobic, and the light pressure that goes with this style reduces wear and tear on the joints. With practice "spinning" becomes easier and more comfortable.
--- Denise