Interactive Speech thingies

I found these videos both helpful and a not so much so. In the first video, Chapter 2.1, I found it unhelpful that they suggested using diaphragmatic breathing. I associate this type of exercise with when I am in a really stressful situation, so doing the breathing makes me instantly tense up, making the situation more daunting. However, in the Chapter 2.2 video, I felt like there were some good techniques associated to giving good speeches and feeling less anxiety about them, like picking a subject you find interesting to you, and knowing the intro & conclusion very well to give you a strong beginning and ending.
Not to be a Negative Nancy today, but I also really did not like Jessica's introduction speech. I thought it had too many metephors and didn't say much of anything at all about, well, anything. I did not understand the point of the speech, was it to give inspiration, but even then for what cause? It could be a speech about how someone has influenced you, but at the end it seemed pretty preechy. And as an introduction speech? It doesn't say much about her, just what she learned form her brother's introduction into the family. That can't be everything about her, or even a good umbrella topic. I just didn't get it, I guess.