Gesticulation--the practice of using your hands and arms to punctuate or enhance your verbal statements--is another valuable body language strategy.
Speakers who use body language actively in their presentation tend to be viewed as more confident and more authoritative than those who do not.
Obviously, different hand gestures can signal different things, and if you simply wave your hands wildly in front of your audience, it may make you come across as out of control.
Instead, focus on reserving your hand gestures for your most impactful words, and try to keep your movements reserved and under strict control.
- Jayson Demers (modified by Amr Badran)