Although you might be mindful of what you are saying and how you are saying it, your body could be telling a different story. The first indication of what kind of person you are is the handshake. A firm handshake says, "I'm glad to be here and doubly glad to meet you."
When you sit down, never rock, or rub the back of your head or neck, drum your fingers or shake your leg. Not only is it rude, it says you are disinterested. Rubbing your nose, even if it itches, could mean you're dishonest. Folding your arms across your chest is a big mistake. It makes you look mad and disengaged. Slouching says "unprepared" [source: Career Builder].
What should you do? Sitting up straight and leaning forward slightly shows you are interested and engaged. Nodding in agreement and other positive gestures shows that you're enthusiastic. Look people straight in the eye, even if you're being interviewed by more than one person. When you leave, be graceful. Shake hands confidently [source: Career Builder].