So what does that mean?

SourceChinkuchi (Hogen): "Chin" (muscle); "ku" (bone); "chi" (power and control). Chinkuchi ("Chinkuchi-nai [he doesn't have chinkuchi]!) is a composite of bone, sinew, and chi for an energy that is manifested through body mechanics.
"The mind (heaven), body (earth), through breath (spirit) is harmonized so it all works together to bring out chinkuchi. Sanchin is nothing but prolong chinkuchi.
Hmmm....no better there....
How 'bout this one from Bing:
.....why can't anyone agree?Chinkuchi (focus, instantaneous and relaxed outpower)
This tidbit is interesting:
How 'bout this:I have a t-shirt . . . yes, that's right! Been there, done that, got the t-shirt Very Happy . . . with the kanji for chinkuchi on it. It was written by Tokumura Kensho, an Okinawan Goju stylist. Most people think the t-shirt actually says "chin-ku-chi" or "bone, sinew, control" but it doesn't. It translates to "Destructive Power" or "Power to Destroy."
source: http://www.isshinkai.net/history09-tomonokai.htmlDuring this trip, I was determined to come off the island with martial arts related calligraphy that could hang in the dojo. I especially wanted calligraphy of hte katakana or kanji for hte Okinawan Hogen martial arts term, "Chinkuchi." When I asked some of our knowledgeable Okinawan friends, they sort of laughed. They found it very odd that someone would want this physical martial arts philosophy printed on paper. We then asked Sensei Tokomura. He was shown katakana for the term that we had and promptly said he had someone who worked for him on base that could probably do it for us. He said he would also have the person print the kanji for the martial virtues that he has hanging in his dojo: COURTESY, FIGHTING SPIRIT, and PATIENCE. The next visit with Sensei Tokomura, he did have these gifts for us. The calligraphy for "Chinkuchi" was very interesting. Chinkuchi was written in katakana (from my understanding the older writings of Okinawa), next to it were the writings for "impact" and then a large display of kanji which reads "destruction power" (Chinkuchi). Many times during this trip, as we would be socializing with Sensei Tokomura and others, he would call my attention and demonstrate and shuto moving slowly to his other open palm. When his shuto reached approximately a 5-6 inch distance from his other hand, it accelerated at great speed, obviously hitting with much impact. He would say that, "Chinkuchi destruction power," then show a measurement of about 5-6 inches with his hands."