This tutorial suggests a few exercises that you do prior to a speaking event. It highlights the importance of stretching the muscles in your face and how to warm-up your voice to properly articulate.

Video Length: 2:07

 

This video highlights what NOT to do with your hands and the proper way to look composed when you are speaking.

Video Length: 1:20

 

This is a quick resource that shows how you produce sound by using  your organs of speech.

Video Length: 0:53