Some people have a natural tendency to talk with their hands. This will either come off as really passionate and expressive, or really annoying. If you talk with your hands, you should do so without being annoying. This video shows you how.
In the video above, Aaron Marino explains how he talks with his hands in a controlled way to get his point across casually without being too exaggerated and off-putting. From being mindful of the space your "hand speaking space" to using a hand rhythm that flows with your speech, he offers some pretty good points for those who want to be more effective.