Perple Gyrl wrote:

The Elliptical is my favorite and stains my knees allot less then treadmill
or bike.

I haven't come across the knee-staining problem before....

But that is an excellent point. My knees have logged more than
enough use/abuse so that they couldn't handle much more. The
circular (or in this case oval) motion involves virtually no
shock and, I find, actually helps build them up.

pb