Amy Cuddy: Your body language shapes who you are

Body language affects how others see us, but it may also change how we see ourselves. Social psychologist Amy Cuddy shows how “power posing” — standing in a posture of confidence, even when we don’t feel confident — can affect testosterone and cortisol levels in the brain, and might even have an impact on our chances for success.

the whole video: https://www.youtube.com/watch?v=Ks-_Mh1QhMc
my favourite part, where she talks about her own experience: https://www.youtube.com/watch?v=6nOfu3MlsIg