The "Kua" is the connection between the upper part and the lower part of the body. The post on Back Power analyses the importance of the back and its key role in the upper part of the body. Activating the upper part alone is not sufficient. If the coordination with the lower part is not possible, exercising "coherent force" is an unattainable dream.
Many people talk about the principle of the "Three External Coordinations" without knowing what exactly it is. The "Coordinations" as emphasized do not simply mean different parts of the body doing things together. It is the transfer of power from the lower parts to the corresponding upper parts that counts.
To achieve the "Three External Coordinations", one should know the precise answers to the following questions:
1. Where is the "Kua"?
2. How to "loose" the "Kua"?
3. How to motivate the "Kua" to coordinate the upper parts and the lower parts of the body?
The saying that "There is no hand in Taiji" has highlighted the importance of this coordination through the "Kua".
The "Kua" is usually considered as the "big fist" in human body - we use the power coordinated by the "Kua" to hit, the hand is just part of the medium in the power transfer process.