It's normal to make small gestures with your hands, as well as facial expressions, as you talk. It helps add to or reinforce what you are saying. But I have some friends who wave their hands and arms much more than average as they talk. Sometimes I'm afraid I'll be hit by a flying elbow if I "listen" too closely! I joke that if I hold their hands still, they won't be able to speak. Do you have friends and acquaintances like that, who act like airplanes or martial arts instructors or baton twirlers as they talk? Does this habit mean that they are more extroverted and outgoing? Is this a common habit? Is it cultural? I've never thought about those questions before, and I wonder if I'm the only one who has to duck when certain friends are telling me a story.