This is actually based on a lot of scientific studies, but not only does our posture communicate non-verbal cues to others, it actually subconsciously guides our own emotions. I know it's weird, but our brains have trouble knowing what emotions we are feeling and takes cues from our own self-image to figure it you. So standing tall and proud will actually make you a little prouder and a little bolder. This is why gymnasts and swimmer do their victory pose BEFORE their routine... to be themselves in the best mindset.
