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Every muscle is subject to the myotatic reflex (stretch reflex) which opposes changes in muscle length, especially sudden or extreme changes. When a muscle lengthens beyond a certain point, the myotatic reflex causes it to tighten and attempt to shorten. This is the tension you feel during stretching exercises. The myotatic reflex is desirable because

The kiai (literally: “spirit yell”) is very important to karate. It involves tensing the diaphragm and expelling air through the mouth, making a short, sharp sound. The word “kiai” is not yelled; the appropriate sound should be like: “eye”, “high” or “eigh”. The exact sound will vary from person to person. The kiai occurs during