I understood that there are a few muscles in the body that get tensed up when we are under psychological stress. I am curious and confused why would certain muscles tense up. Why does my body react to stress by making them tense? What advantage does the body assume in doing that, even if the threat is purely psychological and not physical?
Also, is there anyway to convince ourselves to relax our muscles when we are just psychologically stressed and there's no physical threat at all? Can this brain wiring be altered, or I would say, become more refined or accurate?