system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do many people motion with their hands when speaking?

My partner doesn't even realise that she does it, so it's definitely a subconscious action in her case.
gpt
Human communication relies on much more than just words and tone of voice. Body language is important and hugely telling what someone's true feelings are. Gesturing reveals a level of openness, relaxation, or intensity. Standing perfectly still with your arms at your side comes across as robotic and awkward, because it cuts off that vital subconscious communication.