Examples of body acting

The body can convey character, emotion, and environment. The body can work in harmony with the dialogue or in contrast. The body can tell a story without any dialogue at all. (Reference)

Here is a good example of body acting, with some explications of how we can read it and use it. It is like a tutorial, showing how we can communicate just with the body acting and at the end there is a little scene showing some of them combined in a funny way.
Body language is essential when communicating and it can be used without actually talking, everybody understands it. In this specific video because is a tutorial this examples are exaggerated so we can get them immediately, of course no one is actually reacting in this way in the real life. They would rather be used in animation, in the movies or at the theater.

We can use the body to show emotion: enthusiasm with the eyebrows, shoulders, fingers, knees and feet, same with the anger. Most important we can show character: we can say a lot just looking at the shoulders and the movement for example. Also we can use the body to tell a story like in the scene from the video above.