Do Not Make Short, Jerky Movements
Some speakers seem to be imitating a waiter who has failed to get a tip. Let your movements be easy, and from the shoulder, as a rule, rather than from the elbow. But do not go to the other extreme and make too many flowing motions--that savors of the lackadaisical.
Put a little "punch" and life into your gestures. You can not, however, do this mechanically. The audience will detect it if you do. They may not know just what is wrong, but the gesture will have a false appearance to them.