Body language during practices and matches matters more than most people think, and Diane Flick Williams of Western Washington University has a fun and inventive way to encourage body language communication.
Get in groups of 4. One person is the observer, and the other three people are the "actors." One person starts a scenario. The second and third people add onto that scene with all of the cues they can glean from the first actor about what the scene is intended to be. The fourth person must interpret the scene of the three actors.
The key for this drill is to convey however possible with your body language what the "scene" is to the observer. In addition, the actors must non-verbally communicate with one another to create the scene. Movements must be intentional.