Turning the back is a very bad defense in a street fight. Giving the back is a common practice in wrestling, sports Jiu Jitsu, and judo. The spine is completely exposed to strikes. If you drill in training to turn the back, turtle, then that may happen in an attack. You can’t easily decide not to turn the back in a situation where your reacting because the way you train will be how you defend yourself in an attack.
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