Throughout our adulthood, we accumulate tensions – whether through psycho-physical habit or injury, or whether it’s our jaw clamping our mouths shut to stop us yelling at our boss when we’re angry. Unnecessary physical tension profoundly affects how we sound, by muffling resonance, restricting the movement of the breathing musculature, and constricting the throat so that it’s more difficult for sound to escape.
The ‘knee lock’ is a good way to check a number of muscular tensions – lock your knees by pushing them back firmly, and see what else tenses up. Butt? Thighs? Abdomen? Even the chest?