Enough research & statistics have shown that Non verbal communication or the language of body postures inadvertently conveys your predisposition and can give signals to the onlooker on your personality,confidence and more. What is interesting to know is that your own body posture can also determine how you think and feel about your ownself. While non verbal communication can influence decisions on who we hire or decide to ask out, it can also make your own disposition feel powerful or powerless. This essentially means that a conscious and slight change of body positioning can lead to change in ones own level of confidence. Leanin.org shares a video on power posing.