Doing "The Mr. Clean" can help drive home an argument in the boardroom.
Your shoulder posture in this position is pivotal in shaping how observers interpret the folded arms, according to Noah Zandan, president of communications-analytics company Quantified Impressions.
If the shoulders are rolled forward, others will interpret the arms as a sign of weakness, sending the message that you're scared. But if you roll those shoulders back and hold your head high, the crossed arms become a signal of confidence.
While you're at it, Cuddy says it's important when you raise your hand to extend your arm fully, taking up space, as opposed to resting the elbow on the table. Women tend to bend at the arm more than men.