It can also influence your credibility and students' comprehension and retention of ideas. Facial expressions animate the material you wish to convey. Gesturing and moving about the room can help constructively use up some of your nervous energy, too. Break away from the podium, desk, or chalkboard. Use space to emphasize important points, establish a desired relationship with students, and hold students' attention.
Students learn more when they've having fun.
You may also want to take on the role of narrator and tell a story to the class. You can even sometimes use the students as props. Props can also be used to address or direct classroom dynamics. For instance, one professor takes out a piece of taffy and chews on it. By the time he swallows, students always have some comments.