mastertangler wrote on Sep 21^st, 2011 at 12:35am:

Back from the Docs today. He seemed impressed with the biking I've been doing.

Yes, cycling is one of the best things you can do if you have knee problems: it builds up the quads, which hold the whole middle leg together, without the damaging stresses you get in sports like running.

Make sure your bike pedals have cages (ie not like most mountain bikes) so you can work the muscle "eccentrically" on the upstroke. (Eccentrically = the muscle does work while lengthening rather than contracting).

Cycling can give you a good cardio workout too. :)