: Subtly matching the posture or gestures of the person you're talking to creates a sense of comfort and "interpersonal closeness".

: Smiling widely until your eyes crinkle releases endorphins, which can naturally reduce anxiety and improve your mood.

: Moving your hand in a subtle "nodding" motion while speaking can subconsciously encourage your listener to start nodding and agreeing with you.

: Standing in an open, expansive "high-power" pose for just two minutes can increase testosterone and lower cortisol (the stress hormone), making you feel more assertive.