Re: Terms: I.S., I.P., Neijin, Fajin, Aiki, etc.
..."Fa Jin" is also sometimes loosely intermixed with "Fa Li". "Fa Jin" is literally "attack jin"; "Fa Li" is literally "attack strength".... the implication in both is a *whole body shaking issuance of strength*. "Li" by itself is just the word for strength and often implies normal muscular strength.
Walking back from the grocer's just a moment ago, I thought of a big point that differentiates the "internal" methods from "external" or "non-internal" forms. And that is that attacking methods in the "external" forms like most karate (I won't say "all" karate) cause damage to the outside of the opponent's body in order to damage the inside of his body. But internal forms can damage the inside of the opponent's body without making a mark or causing clear damage to the outside of the body (i.e., rupturing internal organs without breaking the protective bones around them).
What do you think?