Chinkuchi
Taika Seiyu Oyata described Tatsuo Shimabuku as possessing very strong chinkuchi. The term "chinkuchi" is used to describe the power that is generated by properly focusing the mind, body and breath while executing karate technique. It is often considered to be one of the uru or “secret” techniques of Okinawan karate.
Properly utilized, chinkuchi has the result of creating maximum power with a minimum of effort. Chinkuchi is the result when the muscles, tendons, ligaments, breathing, and mental focus are in perfect coordination at a single moment of time.
Chinkuchi is learned as an essential element to the proper development of technique in the classical karate systems of Okinawa like Isshin-ryu, Goju-ryu, or Uechi-ryu. Many training tools utilized by these systems, such as the makiwara, aid in the development of chinkuchi in the karate practitioner. The goal of any classical karate practitioner is to achieve “chinkuchi” at precisely the right moment. It would not be practical for every movement in a technique to utilize chinkuchi, however, every technique should have the potential.
In classical karate, the use of chinkuchi can be simultaneously both an offensive and defensive technique. The focus used to generate power in a karate strike is the same focus that is used by the karate practitioner to protect himself from injury. Chinkuchi is utilized by the entire body and is both a physical process and mental state. It must be learned in stages and, once understood, can then be applied to movement and technique.
The development of chinkuchi in Okinawan karate is accomplished through the understanding and development of several other key attributes.
Zanshin (Remaining Mind): Zanshin means having no break in focus. There is no time to correct a bad technique. We cannot force the situation to conform to our technique. The technique must be in concert with the movements of the attacker.
Proper Technique: Classical Okinawan karate relies on correct posture and body mechanics to generate power in technique, and then allow that power to be transferred to the attacker. Techniques must utilize proper skeletal alignment, and the right muscles in the proper order.
Fluid Movement: Fluidity in movement comes from the relaxed use of the body combined with natural body movements. Techniques are smoothly executed with “whole body” movements.
Timing: Speed and timing go hand in hand. True speed comes from proper body mechanics and timing. Your techniques must be “in time” with your attackers movements. The fastest block in the world will do you no good if the block is there and gone before the punch arrives.
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Here another article by gibert I remeber long time ago I seen a little better article on chinkuchi It was alot more detailed
Boy, oh Boy, Did you Hit The Jack Pot With This Article

The Japanese Word "Chinkuchi" Translated into Chinese, Is "Fa-jing"

And, in my humble opinion, the Article is Right On - Even too the "Secret" Part

It is To Bad that this Concept of Training was keeped a Secret from the External Arts for So long

If You can Find A Teacher That Understands, and Can Teach The "Chinkuchi", in my humble opinion, you Should Start Training ASAP - It is not easy too learn - but, when you have mastered the concept, and all of the different applications forth-with, you will have enhanced your Martial Art, oh - more than 1000%

Ask Master Lambert; If Ya don't Believe Me

The Fa-jing concept Is The True "Engine" of Nonaka Ryu Ju-jutsu; We Feel the Same Way About Fa-jing As Erle Montaigue does

With out Fa-jing, there is No Nonaka Ryu ju-jutsu

Scott; There is An Afoul Lot Of Fa-jing in the Kata "Sunstorm", the name should tell ya something

And, yes - I'm still waiting for the computer wizard to come over

I'm going to give his Boss a call, maybe that will start a fire

Kind Regards
Tom