F M Alexander

F M Alexander was an Australian actor who discovered that his use of his head, neck and back i.e. his habit of putting his head back, caused him to lose his voice. Using mental directions to stop tightening his neck he learned to improve the co-ordination of his whole body and his ease of movement and breathing.

Muscular Tension

You translate everything, whether physical, mental or spiritual, into muscular tension.

STIFFENING

When you are asked not to do something, instead of making the decision not to do it, you try to prevent yourself from doing it. But this only means that you decide to do it and then use muscle tension to prevent yourself from doing it.