I was reading PD Ouspensky’s book In Search of the Miraculous, and I came across this section on the “stop exercise”, which is intended to help break the automatisms of the body. Gurdjieff explained that the people of each epoch had a unique experience of the world through the somatic experiencing of the body’s positions and movements, and that implementing a command to suddenly stop would help reveal this through the examination of new postures.
Soon after that G. began to put "stop," as we called this exercise, into practice in the most varied circumstances.
G. first of all showed us how to "stand stock-still" immediately at the command "stop," and to try not to move, not to look aside no matter what was happening, not to reply if anyone spoke, for instance if one were asked something or even unjustly accused of something.
"The 'stop' exercise is considered sacred in schools," he said. "Nobody except the principal teacher or the person he commissions has the right to command a 'stop.' 'Stop' cannot be the subject of play or exercise among the pupils. You never know the position a man can find himself in. If you cannot feel for him, you do not know what muscles are tensed or how much. Meanwhile if a difficult tension is continued it can cause the rupture of some important vessel and in some cases it can even cause im mediate death. Therefore only he who is quite certain in himself that he knows what he is doing can allow himself to command a 'stop.'
"At the same time 'stop' demands unconditional obedience, without any hesitations or doubts.”
It seems to me an interesting exercise, it could reveal something new about the relationship with the body.