How often is you began fidgeting while expressing anything in public. The level of your nervousness accelerates so quickly that you wish to hide under the rock for rest of your lives. That is why acting workshops are necessary, they allow you learn to overcome your fear of public speaking.
They train you to be in better command of your body language and thoughts. You get a hold of how to deliver even simplest of ideas which such exemption and clarity that everyone assumes that you are made for acting.