You may like these articles on Bung Bo
These were written by Professor Randy Choy of Honolulu. He studied under Sifu David Cheng who was one of Chiu Chuk Kai's disciples in Vietnam. Here are the links and some excerpts:
http://i-chuan.net/pages/Choy6.html
Training in "Thrusting Foot Boxing" One of the most awesome hand forms of the Taiji praying Mantis Boxing system is the "Thrusting Foot Boxing" (Beng Bo), which consists of fifty-six postures. My students always want to know the secret of learning this very old boxing form. My answer is: you have to understand the twelve kinds of praying mantis fighting techniques which led to the creation of the form some 300 years ago from Mr. Wang Lang of the Northern Sung Dynasty.
So let's go through "Thrusting Foot Boxing" and I will give you examples of where these twelve fighting techniques are.
http://i-chuan.net/pages/Choy7.html
In my martial arts classes, I instruct a number of qualified martial arts instructors. Their responses are beyond that of the average martial arts practitioner. It is because of their desire to learn more about Northern Praying Mantis boxing that I decided to share my knowledge to all of you in what to look for in analyzing a boxing form. Of course, you must show some caution: a little knowledge can be dangerous. So proceed slowly and remember, I'm not trying to sell you a martial arts form, but rather, I'm trying to direct you to the method and the way that I analyze a boxing form.
If you are a practitioner of Northern Praying Mantis Boxing, then this article might be of some particular interest to you. The first step I would go through is to review my last article, analyzing your boxing form's horse stances and basic footwork. See if Mr. Wang Lang's twelve fighting techniques of "Thrusting Foot Boxing" (Beng Bo) does apply in some way to your boxing form. So let's go through a few "Rules of Chuan." This is what I do when I learn a boxing form. After learning all of the movements in this form, I would create a mental image of what I'm practicing. Based on the "Rules of Chuan," there must be an entire list of fist, palm, and claw strikes. If your instructor did not supply you with a list, then you've got to list it down yourself.
"The true meaning of a given movement in a form is not its application, but rather the unlimited potential of the mind to provide muscular and skeletal support for that movement." Gregory Fong