Hello, everyone! I'm a Tai Chi student in college who has been training for a year. This is one of my first posts, and I hope to learn alot by coming here. I had a quick question regarding imbalancing a well-rooted opponent, particularly in context of Dr. Yang Jwing-Ming's 2 person fighting set. Say I'm the "bad guy" (I punch first). I tend to have a difficult time with the move preceding the second punch. Also, much later in the form (I forget if it is the bad guy or the good guy), I proceed to do "diagonal flying", but I find this one to be rather troublesome. I've been told (not by my teacher, but by a senior student) that I may not be settled enough in the back leg, I may have to come in closer, etc. While I feel that all of these things are probably true, I also feel that I don't have a good grasp of the concept of "breaking someone's structure" from a physiological/anatomical standpoint. Whenever I do something, I like to know what I'm doing and why it worked. What are some general rules of thumb for breaking structure?