Great TED Talk about Dominance vs. Submissiveness
A great talk from Amy Cuddy about the effect body language has on the person, definitely recommend taking the 20 minutes to view it.
After you are done, take a look at some posts that tie in similar concepts:
– She talks about what we refer to as Dominant and Submissive behavior: read what comprises those clusters.
– See how people respond to dominance here.