In her drama school training Natalie Dormer studied the Alexander Technique:
'When you work the unnatural hours that actors work, and when you fly as much as we do, you have to pay attention to your body—or else you’re a disaster ready to happen'
All celebrity performers know the value of body language; of viewing their own body as a musician would view an instrument, which is why so many train in the Alexander technique.
Training in the technique allows you to infinitely fine tune your instrument. The more you learn, the more you are able to convey. By eliminating hard-wired postural habits you are more and more able to choose with precision how to move at a very subtle level.
Body language is everything.