Reading body language

Lots of communication isn't in words. This article on Wikihow is a nice summary of non-verbal signals you may see in Rochambeau, or Rock-Paper-Scissors game. It's also worth considering how gestures can vary in different cultures. Here's a useful, albeit long, article on body language in Asian countries. Now, the real trick is seeing if you can spot your own body language, as your gestures seem natural to you.