In speaking there are three types of speeches; memorized, extemporaneous and impromptu.
With a memorized speech everything is memorized; your words, hand gestures, body movements and stage actions. At any given moment, if someone has your notes, they know exactly what you will say and how you will say it. Winston Churchill after giving a very bad speech, decided that he would always give memorized speeches. He practiced hours on his words, gestures, body movements and even his ‘mistakes’. To make your speech sound natural rather than memorized, the key point is to practice. The more you practice, the easier it becomes to look natural.
The other end of spectrum is the impromptu speech. This speech can be a twenty minute business presentation or a thirty second elevator speech. The keys to success are speaking skills, practice and knowledge. You can have the knowledge, however if your skills are lacking, everyone will know. With great speaking skills, you can fool people with your lack of knowledge, only for a short time.
Our last type of speech, extemporaneous, is in part 2.