The overall logic of practicing the four Tai Chi techniques of "Peng, Lu, Ji, and An" is as follows: Peng begins with a defensive stance, Lu transforms the opponent into an offensive stance, and Ji and An push and push out the opponent to initiate an offensive stance, forming a cycle of "defense-defense-attack-control" with the opponent. This requires coordinated and integrated application from top to bottom. Key Points: All four techniques must be centered around the waist, maintaining a "empty