Just a taste of cool, not really cold, weather and my left knee and right shoulder (the pair that were operated on) both started aching. I could barely step up on stairs with my left foot. Last winter and early spring I ended up using a cane part time. In the summer, I don't even know who that rickety old man is. When it is warm out, the only reason I don't jog is that I know better. I can hustle up the stairs.