Tension has no place in acting. What ever you do, stay loose.

            Avoid tension in your neck.

            The tension is: delay character's revelation.
  1. An if you feel tension at all anywhere, you can press down with one toe as hard as you can until it hurts. Nobody will know it is in your shoe.
  2. Build up an emotion, heart rate up, no tension. Teach yourself to say "down boy" with tension. Press toe in left shoe to get rid of all tension.
  3. No muscle tension in an emotion.

"In the end, it can't look like acting."