https://www.linkedin.com/pulse/body-language-secrets-incredibly-successful-people-jeff-haden

In our capacity as licensed private investigators, we spend a good bit of time interviewing/interrogating/chatting up people and this requires a solid understanding of the clues, tip-offs and "tells" revealed by body language.  Here is an interesting article that examines not so much the reading of others' body language, but rather altering your own.