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The Jab-Cross-Left Hook is a three-punch combination that covers the centerline and wraps around the opponent's guard. It is widely used in boxing, kickboxing, and Muay Thai because the cross exposes the side of the head for the hook. Proper execution requires rotating through the lead hip while keeping the rear hand covering the chin.
The 1-2-3 adds a lead hook to the jab-cross, giving you a three-punch combination that covers the centerline then wraps around the opponent's guard. It is the most-used punching combo in boxing, kickboxing, and Muay Thai, and for good reason: the cross draws the opponent's rear hand forward to block, leaving the side of the head exposed for the hook that arrives from the blind side.