There is no question that people can speak volumes without uttering a single word. Non-verbal communication, including body language, can be a powerful sales tool if one is able to understand its signals. However, when you realize that the human body can perform over 700,000 unique movements, the idea of comprehending all those signals would seem like an unrealistic endeavor. Do not despair because just having a rudimentary knowledge of some basic signals and gestures could greatly improve your ability to sell.