Basic Training?

On Monday when I picked Dexter up from school, I noticed that they weren't in the regular classroom and, for a moment, thought that maybe I had come an hour late to pick him up.  Then I heard some ruckus coming from the "big" room and thought I saw Dexter stomping across my field of vision through the the narrow window into the room. 

Then I saw Dexter hopping on two feet back the other way followed by some other young hoppers. Before long, I saw Dexter slithering across the floor with a bunch of other kids. Then he came back in the other direction crawling on his hands and knees.  I was sure that Miss Lois had had a "rough day" and decided to put the kids through basic training but when I asked him about it later he told me that he "hopped like a bunny, stomped like a dinosaur, slithered like a snake, and crawled like a dog."