We've long known that body language communicates nonverbal messages and influences how we're perceived by others, especially in the workplace. New research shows that our posture also affects how confidently we behave and even our hormone levels. Striking a powerful pose increases confidence, reduces stress and boosts testosterone. Conversely, a submissive posture or nervous habits like twirling a ring can have the opposite effect. We explore the latest research on nonverbal communication in the workplace.