First of all, is imprtant to say that it was really interesting to see this video about a typical Spanish class, where the teacher introduced a new topic in her class. Where She introduced "illnesses", but here we were just watching the video, we were not listening. it was without the audio but situation was simple to understand.
I realized that the use of th body language is essential and the teacher in the video
used body language to give examples of different aches. For example She pointed teeth meaning a toothache, she showed a stomachache making some movement of pain with her hand in the stomage and etc.
Also she used extra material such as pictures to make more interesting the explanation, as well as the black board where she wrote every new word. The students sat in orderly rows in front of the teacher, this was good considering the task was to introduce new vocabulary, this way everybody would listen what the teacher had to say.