Journal of Combative Sport, Sept 2005


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Judo: Maximum Efficiency and the Body Mechanism

By Gunji Koizumi

Originally appeared in Budokwai Quarterly Bulletin, April 1945 to January 1946, pp. 20-21. Reprinted courtesy Diana Birch and the Budokwai. Copyright 1946, 2005, the Budokwai. All rights reserved.

The most effective application of the body mechanism naturally is governed by the dynamic law or the principles of leverage and balance. For convenience, I will dissect and tabulate here the general principles that apply to judo.

These technical principles are the basis of and the vital factors in the efficiency of judo. The skill depends on the ability to operate them in the right direction at the correct moment.

To incorporate these principles into a single action in a psychological moment is beyond mental control. Therefore through constant practice the body must be trained to act automatically. In general practice the sporting instinct certainly must be satisfied, but the study of theory must not be neglected.

If in your effort you find your shoulders move upward the shape of the wheels changes and the balance is weak, the opponent's arms or body are in your way (assuming he is passive), and you should take this as the sign of wrong movement.

There is no dogma with judo. Therefore a method cannot be said to be wrong or right, but by testing it against the maxim "maximum efficiency and minimum effort" it can be said that one is better than the other. Thus judo is progressive and each one of us is a potential contributor towards its further development. No one is perfect; all are fellow pilgrims to unknown possibilities.

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JCS Sept 2005