Video / Tai Chi Internal

While it may be hard to understand, the recommendation is that the student should plan to continue the yoga practice after being deprived of the physical body. Look at this video where a master of Tai Chi performs some forms perfectly but also study where his attention is being place and where his energies are weaving and with what other force.

Then consider if that is done in respect to the internal forces only. Such forces are the intellect-imagination psychic apparatus, the memories which command attention and the sensual energies which enforce their expressions and collection.

What would it be if that practice was done internally only and with no other enemy or unruly force but the ones which reside in the psyche?