Focus refers to the concentration of all the energy of the body in the instant a particular technique makes contact with its target. This concentration of energy is derived from the tension and relaxation of certain muscles at the correct time in conjunction with the exhalation of air from the lungs as the technique is completed. Kime will not be released if the tension of the completed technique lasts for any measurable length of time, as Kime is manifested by the speed of the technique involved. Karate movements convert power into speed, thus the fist when punching gradually accelerates and hits its target at maximum speed. If all the muscles are tensed or focused at this instant all the body's strength will be transformed from speed to power as Kime is achieved.
Everyone can kick or punch with speed and apparent power, simply by using the weight of the body or leg as it is thrown forward. This type of strength is the sort that all possess, and which is used in everyday situations, differing from person to person according to their physique. However, the strength incorporated in all Karate techniques is derived from muscle tension and relaxation, and does not, therefore, rely on body weight or size. Anyone, large or small, has the possibility of phenomenal power, once they learn to use their body correctly.
Used correctly, it is possible to reach a point at which the body will be producing maximum output in the execution of any technique. This is not to be confused with what a person thinks is the maximum output which is far below the theoretical limit.
Suppleness is important in order to achieve maximum extension and contraction of all the muscle groups as various moves are performed. The greater the distance that a contracting muscle moves as it pulls upon a limb, the greater the speed and, therefore, power of the technique. Co-ordination is vital if energy created at one point is to be transferred to, and combined with, the energy created at another.
In order to explain Kime one can compare latent energy of the body with that of sunlight. By the use of a lens the light emitted can be concentrated into a single point; the light becomes capable of burning paper, wood or even metal. Before or after this point, however, the light has very little power.
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