Fitness for the Agelesss

From Job's Body, Chapter 8, "The Sense of Effort" we continue to see anatomical descriptions that shed light on the sensations that are felt during tai chi movement.
   Tai chi principles can seem to be obscure directives lacking any concrete basis.  First the translations from Chinese to English are lacking in full meaning.  Use Intent rather than Force, Seek Quiescence, Balance Inner and Outer Energy may have meaning, but are open to a great dal of interpretation.  Each Grand Master's description or experts interpretation may expand the concept or narrow the focus randomly.  I will use just one such interpretation to illustrate the obscurity and then suggest that the bodies "Sense of Effort" is integral to all.

The sensory feedback that comes from the musculature is below the level of consciousness.  See pages 248-250 for full examples of how the muscle spindles and golgi tendon organs, along with the cerebellum and brain stem ganglia, create a sense of effort that is the essence of our reality of time, space and self.

I have moved on with the reading so will just summarize by saying how strongly the tai chi principles are supported by the fact that the sensory cortex is responsible for organizing the muscle memory that allows us to be so precise in repeating learned movement.  It would seem that the muscle cortex would do this job, but in fact, the muscle cortex takes its cues from the sensory cortex and just carries out how we feel when we move.
The Taijquan principles of:"Use intent rather than force," "balance inner and outer energy", and "seek quiescence" all are indicative of the sense of feel that initiates movement, coordinates it and allows for its smooth execution.