Sit straight with your head up
It is best to sit straight with your head held high. According to Amy Cuddy, a Professor of Psychology at Harvard University, sitting upright can have a biological effect on the body that helps improve self-confidence. In her study, Amy saw found that when sitting upright with the body occupying a larger space, cortisol and testosterone levels in the body rise, which leads to an increased sense of self-confidence. So, if you want to feel confident in a short time, place your shoulders back, lift your head, and sit or stand straight. Your body will do the rest of the work.