Scientist are discovering connections between the muscles and nerves that control the axial spine and the adrenal medulla. In other words, they are discovering that there is a neural connection between the core muscles and one’s ability to feel or handle stress. Perhaps standing up tall can actually make you feel more confident and less susceptible to stress?
“The Pitt team didn’t think the primary motor cortex would control the adrenal medulla at all. But there are a whole lot of neurons there that do. And when you look at where those neurons are located, most are in the axial muscle part of that cortex.” (Hamblin, 2016). Read more here.