Breathing techniques?

When watching the first video 2.1, I couldn't help thinking. I will never use any of the information they are giving to me. Breathing techniques? I would feel like too much of an idiot, sitting around doing these. However, as I got to the second video some interesting stuff cropped up. Like how people prepare for their speech. Using visualization as you practice your speech and pretending that you are in the classroom. It gave me a few ideas like finding an empty classroom, and practicing my speech there because if I can't do my speech there, I won't be able to do it anywhere else. The other idea was, going into classrooms before the beginning of a class and hanging out up front. I had to do this while I waited for my instructor once and at first it felt odd, but eventually I was able to look around the classroom at all the people without minding them.

Another thing that I felt was pertinent in the videos was how to select topics. To research and pick something that is familiar to you. Something that I already was going to do, but makes me that much more reassured.