I was walking my class back upstairs after lunch and they were a little talkative. I usually stop and turn around to take control of my class, but there were no other classes around so I ran. It was fun to turn around and see all the 13 and 14 year olds breathing hard when they got to the top of the stairs. They were too out of breath to talk anymore. I'm not going to pretend that 46 stairs is some Herculean effort requiring Olympic level fitness, but I can see my fitness level is definitely improving.