This video explains why people need to open their mouths when they speak. When you do not open your mouth you mumbling and people cannot hear the speaker. The more you open your mouth, the more you can project your voice and the more effortless speaking becomes. Stretching your mouth before your speak will help to relax your mouth so you can open your mouth properly for good speaking. Public speaking is a great activity for kids of all ages. This video is of good quality and appropriate for elementary, middle and high school students.