Since you axed me, I'm gonna essplain it to you.
A small part of the Rory Miller workshop a few weeks ago was dedicated to power generation. The simple reason for this is that striking a violent threat without doing damage is a waste of time. If you are already receiving damage, your ability to fight is diminishing as time passes.
Rory is able to pass on some very useful material about power generation in a very short time.
Let me start out by saying I think he did a great job of getting people to think about the importance of power generation to self-defense, and how to improve ones power in a short period of time. Tasked with the same goals I would not have done things much differently. However, I’m dedicated to discovering the highest level of martial arts theory available, so we have some taking apart to do.
Here is what he taught.
The drop step is the most immediate way to generate power.
Press the back heel.
Twist suddenly at the hip (kua).
Keep the whole arm and back loose like throwing a baseball.
These all increase power. When put together they dramatically increase power.
I realized a long time ago that I have way more power than I actually need to fight, from a self-defense point of view what I have to say about power generation is trivial. I suppose the charge of esoteric is a fair description of my opinion.
Rory himself raised the issue of why each of these work. With a better understanding of theory we can improve our results. So here are my explanations.
The drop step is used extensively in African dance and many dance systems, it is also the main strategy taught for punching in Northern Shaolin. It works primarily because it adds the force of falling mass. Rolling an elbow forward on the opponent’s arm while doing a drop step puts at least 100 pounds of force, multiplied by a few inches of gravity, onto the opponent. If the opponent’s structure is compromised already, the movement will likely cause damage. It can also shake up a person who has good structure. The flaw of this technique (all techniques have flaws) is that it is vulnerable to a sweep (or a rotation) while in the air, and tends to be over committed at the moment when it lands, particularly if it misses its target.
The same technique can be done internally, without leaving the ground or committing to one foot, but it takes a long time to train.
Pressing the back heel is also a major part of Northern Shaolin training. It’s main value is that it backs up projections-- it is what most people do when they jab with a spear to stop from being thrown back by the forward motion of the wild thing they are jabbing. It is not actually a power generating technique. A foot pushing off the ground (whether with the heel or the toe) generates momentum; however, once the momentum is achieved the foot can leave the ground without any loss of force. Pressing the back heel can have another purpose, which is to uproot. In tai chi, we teach people to uproot off of either foot and generally it is the foot which is weighted over the toe which does the uprooting. So even if your back heel is down to root against the forward motion of your opponent, your front foot can still be used to uproot.
Perhaps the full extension of the back heel adds a little momentum (as compared to leaving it up), but that isn’t its main function. No doubt everyone who studies martial arts should learn this technique and build on it, but eventually it should be abandoned. Its flaw is that it combines with the drop step to create an on/off switch. The drop step entails a loss of stability, the pressing of the heel is an attempt to regain it. A superior theory of fighting seeks to eliminate the gap in power created by this transition between “on” and “off.” Some stability is gained in the front/back plane from pressing the heel, but it is lost in the other planes, making the striker vulnerable to rotational force or up/down force. A superior theory of fighting would never strike in a way that sacrifices the six dimensions of power: up/down, left/right, front/back (called liuhe in Chinese). It is preferable to keep the body moving like a rolling, spinning, expanding/shrinking ball which never comes out to a point. Lot’s of Tai Chi guys take this to mean don’t punch, but that isn’t correct, it just means that when you punch, the punch has to be part of a rolling ball.
“Keep the whole arm and back loose, like throwing a baseball” is correct and needs no amending. The more relaxed and empty the movement, the more whole body integration and weight are available for generating force. In class I actually interjected that some people may experience shoulder injuries if they lack protective shoulder muscle. The injury can happen when a person throws the arm with a lot of force while only relaxing halfway. It’s probably best to work this idea gradually. Eventually ones entire body weight can be added to the force through the sequence relax, empty, unify.
Rory actually told us he was uncertain why “Twist the hip suddenly” helps increase power. Here is my explanation. First, rotation in the hip, what in Chinese martial arts we call 'turning the kua,' adds some rotational force so it makes forward force more difficult to stop, deflect or neutralize. Second, the suddenness of the technique is akin to shaking. It loosens the ‘meat’ from the bones and automatically adds fluid weight to the strike. Third, it cuts the body at the waist. This is actually a flaw, but it works! It diminishes structural force from the feet to the hands, however, it increases the moving mass available for the punch. It basically sacrifices the structure of the legs for the weight of the torso. No doubt many people will think I’m crazy for suggesting that loss of structure is a good thing.
Structure can be broken or uprooted-- fluid, dynamic mass can not.
So to summarize: The drop step can be hidden. The heel press isn’t necessary for power but can help with rooting against an on coming force or uprooting a threat’s structure; however a superior fighter will use your structure against you so eventually heel pressing should be discarded. A loose arm increases power if it integrates with the relaxed emptiness of the whole body. The sudden twist of the hip is a flawed technique but has positive effects on power generation anyway.
The big problem with martial arts is that they work. Since most of us will never need to cause massive damage to another person, if we measure martial arts by “effectiveness” they are all a massive waste of time. Most martial arts training will effectively increase power generation as long as you don’t train yourself to pull punches with free sparing, or subordination to the teacher.
While power for power’s sake is a fools errand, the martial arts I teach should give the student more than enough power to overpower a much larger person, or multiple people. But hopefully that will never need to happen. For me, the never ending search for power is just like a dance-- it is simply a happy consequence of freedom-- it is a unique expression of real joy.