Attacking the key lock (like stephensharp said really key lock is the grip used so technicly americana and kimura are both key locks) from with-in someones guard is a good way to lose your posture.
Attacking the key lock (like stephensharp said really key lock is the grip used so technicly americana and kimura are both key locks) from with-in someones guard is a good way to lose your posture.
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