When you don't look someone in the eyes, it can signal deception or a lack of respect. 

Bad posture signals to others that you lack confidence and have poor self esteem or low energy levels.

A handshake that isn't firm will signal a lack of authority. One that is too firm could make you seem overly aggressive. 

This stance creates a sense of being closed off and may signal to others that you are disinterested in them or don't buy into their message.

If giving a presentation, when you look down while making a point, it loses all of its power and can may you look weak. In everyday interactions, it can make you look uncomfortable or self-conscious. 

Too much physical distance, angling the body away from the person you're speaking with or not leaning into a conversation shows that you are uncomfortable, distrustful or disinterested in the subject.

Fidgeting and playing with hair or clothes can reveal an excess of energy, which signals discomfort or anxiety.

When you are closer than 1.5 feet away from a colleague or you treat their possessions and office space as if it were your own, it signals disrespect and that you don't have a clear understanding of personal boundaries. 

Glancing at the clock or at your watch or even looking past a person who you're speaking with will communicate disinterest or arrogance.

Scowls and frowns, often unintentional and unconscious, communicate unhappiness and disagreement.

Me - Folded arms, angling body away from others, fidgeting and touching hairs, frowning or scowling

She - Avoiding eye contact, weak handshake, looking down, glancing at the clock