Understanding dynamic concepts is more difficult than understanding static ones. The present study showed that understanding dynamic concepts can be enhanced by gestures that convey action. Participants learned how an engine worked from one of two videos, with identical verbal scripts and identical diagrams. One video was accompanied by gestures showing the structure of the system; the other was accompanied by gestures showing the actions of the system. Both groups learned the basics of the system. Participants who saw the action gestures depicted more dynamic information in their visual explanations of the system and included more dynamic information in their verbal explanations of the system. Because they are inherently dynamic, gestures appear to be especially suited for conveying dynamic information.