Body language in a negotiation is just as much about reading other peoples' signals as it is about understanding your own.
Listen to this Hacks Capital podcast episode from Simon Rycraft's discussion with Mark Bowden and Scott Rouse.
Mark is a global authority on nonverbal communication. Voted #1 Body Language Professional in the world for two years running. Mark is also the president of the National Communication Coach Association of Canada, Co-Founder of a communications training company "TRUTHPLANE" (where his clients include leading business executives, politicians and CEOs of Fortune 500 companies. Mark is the bestselling author of 4 books on the subject of body language and human behaviour, the most recent of which is "Truth & Lies - what people are really thinking". You can often catch Mark on daily talk shows as a resident Body Language expert and I highly recommend his TEDx-Toronto video on YouTube!
Scott Rouse is a behavior analyst and body language expert who also trains a wide range of professionals from doctors, to attorneys, to senior executives, to entertainers. He holds multiple certificates in advanced interrogation training and has been trained alongside the FBI, Secret Service, U.S. Military Intelligence, and Dept. of defense. Scott is also the author of another new book that I highly recommend, "Understanding Body Language"!