Just reread what I wrote.
The problem with what I wrote is that it makes no sense unless you have or know about having a connected body.
No connected body, everything fails.
What does it mean to be connected?
That means you are in such a state that if someone touches your forearm they do not feel your forearm.
They touch your forearm and they are actually touching your tanden/ground/opposite foot or all of the above (take your pick -depends on how you are connected by choice).
Having a connected body is important for sword work, for jujitsu, for Wado. Toby Threadgill's teacher, Takamura Sensei called this the Budo Body.
How do you create a connected body? You have to do specific exercises.
I can't describe them here. But what the exercises do is very specific. They condition the body by elongating, stretching, strengthening the fascial tissues, the tendons, muscles.
For reference go google Thomas Myers - Anatomy trains. Our bodies are prewired with fascial connections. Activating them gives you access to power.
The Chinese figured this out long ago. The Japanese took it. How to activate, how to train, how to utilize our fascial train is the stuff that makes up much of the internal martial arts world.
It's more complicated than this but it is a good starting point.
I tell people that if you want this stuff (internal power) then you first have to understand structural integrity (correct skeletal alignment) and develop a connected body.
Can you lift that beer bottle in your right hand by being connected to your left foot? How do you think Kuroda is beating people arm wrestling on the floor?
http://www.youtube.com/watch?v=sXsMSoXrNgo (4:32). He is using his cross body connection. His right pinkie is wound thru his left foot. Cross body connection - thus incorporating his whole body. He is pinkie wrestling with NOT his pinkie. He is pinkie wrestling with his BODY. In Wado we punch with our body. We block with our body. Hmm...heard that one a billion times....