Modulate your voice. Your vocal cords are a tool which can do absolute wonders, when used properly. First of all, make sure that you speak clearly. Remember not to speak too fast, because people may not follow. The best idea is to record yourself on a voice recorder and then listen to yourself speak several times over. It will give you insight on what you can improve upon in your style of speaking. When performing in front of people, you need to change your voice frequently to evoke different emotional states in your listeners, which will keep them from getting bored or distracted quickly.
