I had a very good commute this morning. My knees have been bugging me and it's made me very frustrated. Yesterday I was feeling like it was never going to get better. But I've been working on keeping my cadence up and not mashing... and not getting lazy and slow, because I need some exercise in my life. Today I got in to things and had time to pay attention to my pedaling style. I made sure I wasn't putting much strain on my knees and putting steady pressure on the pedals through most of the stroke, and lo and behold I was soon going quite fast, pushing through the wind, knees feeling good...