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While researching I understood one thing. Until that moment I had practiced karate with an illusion: I confused contraction with strength and tried to contract the body searching for strength, without thinking that contracting the body actually is equivalent to blocking the movement. This was a fundamental mistake.

I forced myself to massage and relax a body that for so many years I had worked so much to harden.
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I established the goal to elaborate forms and movements that were to be natural and spontaneous as if I were once again a beginner. This change in attitude made me discover a truly superior effectiveness. I then understood the teachings of Master Funakoshi: "We must not oppose nature".
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Strength must flow through all our body without any type of contraction during its trajectory. A mortal blow is one that concentrates all its energy in one point. In other words, we must project all our being into the body of the opponent. A tsuki must be natural.