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f) your opponent is exhaling or has just finished exhaling;he is losing his ki and his energy is at its lowest point.

g) your opponent is off balance, or changing stances, or shielding his eyes; he is then open to an attack.

Proper timing can only be achieved by intensive training in kumite and shiai.

Speed is important not only in reducing the risk of a counter-attack by an opponent during the execution of a technique, but also because speed is transformed into power. The kinetic energy of a mass M moving with a velocity V is proportional to the product of this mass by the square of its velocity. Thus the kinetic energy of a mass moving at 10 meters per second is 100 times greater than the energy of the same mass moving at 1 meter per second. This clearly shows the advantage of executing a technique with speed.

Speed is produced by muscular action. The coordination of the proper muscles can be improved by repetition, eliminating the contraction of antagonistic and unnecessary muscles.