I enjoyed reading this post, quite interesting. It seems like we learn to control our bodies since childhood but it is more serious work, frankly speaking. We should put more attention to our gestures and facial expression. When I was in college, I had to prepare for public speaking sometimes. I was sure, it is not a big problem, I can do it. Well, I did not know where I should put my hands while speaking! I started walking around a room... Definitely, I was interested in improving my body language after my unsuccessful attempts. I even found some books on this topic in the college library. And recently, I came across another interesting material on differences between men and women using body language: https://ivypanda.com/essays/communication-differences-between-men-and-women-using-body-language/
I am sure that everybody who works with people needs to develop body language as a business skill.