Ignatius Teo wrote:
How about it's aligning your right hand, elbow, hips, hara, (right) knee and foot in a structure that makes it possible to use the ground force to transmit "power". The movement is like fune-kogi undo and identical to a jo tsuki.
"Align" is a tricky word. I often think that the best way to learn to hit or push with your middle is to use a "straight arm" ... the stiffened arm becomes then an undoubted "transmitter" and the "alignment" and muscular tension in the arm keep it strong enough so that you can hit indeed with your middle. But we can't run around straight-arming everything, every time we want to hit with the middle (but hey... it's a good way to get a feel for the idea at first).
So like I've said before, the trick is to not only to learn to use your center but to condition the path to the extremities to (a.) coordinate the transmission of the force and to (b.) be strong enough to handle that transmission.
You can learn to coordinate that transmission with the mind/body things (obviously there are a number of favorite methods, some of which get fairly mystical, etc.)... but the training is usually what's "hidden". "Alignment" becomes what you will it to be.
If you stop and think about it, almost all of the "ki tricks" and kokyu demonstrations are really about strengthening some extremity to be able to convey the forces at the middle out to the extremity. The "jo trick" is an example of exhibiting training of getting kokyu power all the way out to a stick held in your hand. Standing on one leg while someone pushes your forearm is really only getting the power of the ground and middle to your forearm. The unbendable arm is about getting your middle out to your elbow. A kokyu throw is about getting your middle to touch your opponent via some part of your body and propelling him (well, there's some conditioning and maybe a couple of other tricks of training, but the central idea is the same). The being difficult to lift is about training your body to "sink" and yet automatically get your weight to wherever it is being lifted. It's all the same thing, if you think about it.
The other part of the "trick" has to do with the other person's body alignment, and where their vertical stability is weakest, only that the trick is transmitting the power thru their elbow to their center and out their right knee in a spiral.
Theoretically, all you should need to know is what his core forces are and adjust yours ("harmonize") accordingly through a good connection (well, if you really are an expert in the understanding and manipulation of someone else's core forces, I guess you could manipulate and throw them with some feints and not need a good connection... we could call that an "aiki" throw).