Just a couple posts ago, I was thinking my bike commuting days where through. My commute got more than twice as long and my knee was giving me trouble. Then my wife flummoxed me by buying me a new, unexpected and totally impractical single speed bike for Christmas.
I've used my break between Christmas and New Years to get to know the bike and take a few shortish rides on it. Being a single speed, I have to pedal at different tempos according to what kind of incline or decline I'm on, plus I need to get my butt out of the saddle occasionally to pound up a hill or accelerate from a stop. I think this was giving me a good workout and perhaps the varied pace helped my knee toughen up. But still, it was sore when I got home.
Until tonight. Tonight's ride was still shortish, about 10 miles, but when I pulled into the driveway my knee was totally pain-free. In fact the way it felt, I think I could have done another 5 miles without a problem. I was getting pretty discouraged about riding, but this single speed is curing me of that. Riding is fun again.