For example:

1. To get the audience to like you, make eye contact. People tend to pay more attention to and like those who look them in the eye.

2. To boost your confidence, open your chest and arms, and keep your back straight.

3. To demonstrate authority, be calm and use small, stiff gestures.

4. To draw the audience's attention to something, point directly at it and look at it yourself. The audience will follow your lead.

5. To convince the audience of something, use positive gestures — smiling, nodding, open movements, etc. — throughout the presentation.

Source: entrepreneur.com