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sokuto kick
A kick with the blade or knife-edge of the foot. This is the outer edge of the foot, opposite the arch, running from the little toe to the heel.
To form the koshi, the toes are curled back, and the ankle turned downward, so that the instep is in-line with the shin, like a ballerina.
A simpler way to identify this technique is when the kick looks like it may sprain your ankle upon connecting with the target.
Examples
