Body language is a very important part of communication. If we pay enought attention to how a person conducts himself we could say a lot about he's emotions and what does he truly think. Here are few examples of how we should understand some signals and postures:
Gesture: Brisk, erect walk
Meaning: Confidence
Gesture: Standing with hands on hips
Meaning: Readiness, aggression
Gesture: Sitting with legs crossed, foot kicking slightly
Meaning: Boredom
Gesture: Sitting, legs apart
Meaning: Open, relaxed
Gesture: Arms crossed on chest
Meaning: Defensiveness
Gesture: Walking with hands in pockets, shoulders hunched
Meaning: Dejection
Gesture: Hand to cheek
Meaning: Evaluation, thinking
Gesture: Touching, slightly rubbing nose
Meaning: Rejection, doubt, lying
Gesture: Rubbing the eye
Meaning: Doubt, disbelief
Gesture: Hands clasped behind back
Meaning: Anger, frustration, apprehension