As humans one thing we love is flattery - whether we own up to it or not. In sales you are taught how to mimic the body language of the customer, as a form of flattery. Clearly, not a good idea to over use but a bit of mimicry can go a long way.
When you are interviewing or have a one to one session, allow your body language to mimic so that you create a connection with the other person. Remember 55% of communication is through body language, and only 7% is through the words......so body language is important in any relationship.