Exerc. Class 55:00 
Ex. class in Chatham. Today's offering was 10-10-10 (warmup, then 10 min each of aerobics, stepping, weights... plus abs and stretching). I pulled out a short step for the stepping portion because my knee hadn't been twinging much. And it didn't twinge much! I iced it after class, and plan to not try again until next week, but maybe I can slowly ease back in (it's my favorite part of the class and I've missed it). Just need to concentrate on holding the muscles around the kneecap firm as I step to avoid the pain underneath. [And maybe at some point try the knee-strengthening exercises Suzanne posted about.]
Progress. And the stretching went well and I didn't even feel too tight.