Taiji's All Round Defence

While i was just strolling, on the streets today, it suddenly dawned upon me that the Yang Style taiji form has really good defense, not even one of the move neglects defense. When attacking, defense is not forgotten(see Brush Knee Twist step and the kicks). When turning, it is also not forgotten(see Bring Tiger Back to Mountain, Jade Maiden), not to mention Cloud Hands. Thus it is one should keep in mind the defense properties of the various moves and how to use them well to build a continuous and impenetrable defense.