Deane Juhan

“Our flesh is like silly putty that distorts when it is ignored. We are constantly obliged to actively participate in its formation, or else it will droop of its own weight and plasticity.
This incessant formation we cannot stop. We can only make the choice to let it go its own way - directed by genetics, gravity, appetites, habits, the accidentals of our surroundings, and so on - or the choice to let our sensory awareness penetrate its processes, to be personally present in the midst of those processes with the full measure of our subjective, internal observations and responses, and to some degree direct the course of that formation.

We do not have the option of remaining passively unchanged, and to believe for a moment in this illusion is to invite distortions and dysfunctions. Like putty, we are either shaping ourselves or we are drooping; like clay, we either keep ourselves moist and malleable or we are drying and hardening. We must do one or the other; we may not passively avoid the issue.”
― Deane Juhan, Job's Body

“Hence the term “voluntary muscle” is in many ways a figure of speech. I can consciously command a movement, but I cannot consciously command the recruitment of every muscle fiber which must be used, nor the precise order of their contractions and lengthenings which actually produce the desired effect. This is to say that every consciously willed movement is always conditioned by two things: genetically established organization and habitual usage. Our genetic organization is quite plastic, open-ended, filled with potential variations in behavior; on the other hand, habitual usage can become just as limiting as it is convenient, and can become a tyrant to exactly the degree that it becomes practiced, automatic, unconscious. We are free to train ourselves to act differently, but it is very difficult to suddenly act differently than we have been trained. The tendencies in our motor behavior created by genetically determined patterns and by habitual usage do not lie within the muscle cells, nor even in the motor neurons that unite them into motor units. The search for the organizational factors of purposeful muscular control—whether it be action or relaxation—takes us deeper and deeper into the central nervous system, where we find that every muscular response is built up, selected, and colored by the totality of our neural activity, both conscious and unconscious.”
― Deane Juhan, Job's Body: A Handbook for Bodywork