There is a link here between pronunciation work and coaching in sport, athletics, dance or movement. It is a highly sophisticated and unbelievably sensitive physical activity. And when we look at it this way we immediately find some quite different ways of studying it. They find there are quite systematic things they can do to change the way they say a sound or stress a syllable once they start to become aware of how to contact the muscles that make the difference. Making conscious contact with the muscles is not new, since everyone did this as a baby when learning their first language.
Muscles move, and movement can be visible.
Deaf people in every language can lip-read by watching the sequence of muscular movements with their eyes. In fact the muscular movements of pronunciation cannot be heard at all, it is only their effect on the vibrating airstream that can be heard. As soon as we realise this we can introduce the visible aspect to pronunciation work. The movement of muscles yields an internal sensation, or feeling of movement, through the nerves in the tissue at points connected with the movement. So, in addition to hearing sounds with the ear, we can see movements with the eye and also feel movements through the internal sensation of muscles.