A variation on this exercise is to tense each body part briefly and then relax it. Deep and slow breathing exercises. These can be combined with the above. The literature and Web sources on stress, presentations, and sports performance are voluminous and contain many more relaxation exercises, but these are the most common. Stance Your stance tells the audience how you feel.
Upward movements convey enthusiasm and energy.
Downward movements suggest weariness and discouragement. You communicate via your posture before you even say the first words. You want to avoid shuffling to the lectern as if you anticipated an execution. Most people learn how to smile to their advantage for the camera at any early age. They can do it on cue.