Scrap I am intrigued by this. The exercise standing on one leg with your eyes shut is basically a proprioception exercise. As far as I'm aware sensory nerves in the ankle for example, tell the brain that there is movement - once that movement reaches a certain point the brain then releases an impulse to contract the necessary muscles to maintain balance. The muscles generally overcompensate then the same thing happens on the opposing side. The greater the movement on either side means the poorer the balance is and has more of an effect on the equilibrium of the inner ear which detects the amount of movement and the velocity of the movement produced in the head.
The same principles can apply to multiple dynamic movements. The way I understand it, is that if you can decrease any additional movements apart from the desired ones, including head movement the muscles will receive the correct signals from the brain to produce the optimum movement.
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