Being powerful is important, and knowing how to become more powerful in your presence helps you to get the thing done (or to appear less powerful if you want to blend in). Read this fascinating research that suggests adopting “powerful” poses before a meeting can change your behavior (for the better in terms of power) in that meeting. Be clear: not to be done in public!! Practicing Certain Poses Creates a Sense of Power
Put this together with this research around the pronouns you use which show how you perceive yourself, power-wise.