For example, make yourself small. Look down at the floor. Maybe put your hand on your neck and cross your legs. Just two minutes of holding this kind of pose has been found to lower testosterone and increase cortisol, making you feel less confident than you did before you started posing.
Conversely, try to take up as much space as possible.
Sit like you own the place. Stand like you're a rock star. Your body will start sending signals in the opposite direction, making you feel more powerful than before you began posing.
Effective leaders are found to have consistent and specific patterns of testosterone and cortisol in their body, resulting in dominant and non-stress reactive behavior. These are leaders who are assertive yet laid back.