Just like in real life, characters in writing use more than dialogue to communicate. Developing believable characters involves many different aspects of a person, from emotional triggers to tics of the human body. Character posture and body language can say a lot about a character’s physical or emotional state or dictate the type of personality they may have.
Incorporating different postures for specific characters into your character creation process can help define who they are without having to load your story with extra exposition or write a laundry list of traits for the reader to remember. Detailed postures can also help a new character stay memorable.