The knee is really sore. I think I figured out why, though. When I get held up at intersections (and there are several), the side-to-side in-place running that we do while waiting is putting a torque on the knee. I’ve felt it several times. Aha. OK — stop that. No more torque.
Today was a no-impact day on the bike for 45 minutes. Weight was 146.6.