"Tailbone (sacrum) tuck-in" NOT mentioned in tai chi classics

"Tailbone (sacrum) tuck-in" NOT mentioned in tai chi classics
By Dr. George Ho of Vancouver
The book (Acquiring the CranioSacral Postural Reflex with Meditation and Tai Chi for Longevity and Enlightenment) is available on Amazon:
https://www.amazon.com/Acquiring-Cran...
The "dǐngtóu xuán"頂頭懸" sign of Taijiquan comes from Wang Zongyue's " The Thirteen Postural Signs Song 王宗岳《十三勢歌訣》": "The body is as light as if the head was hanging in the air". The head's feeling of dǐngtóu xuán"頂頭懸 is interpreted as the head has the feeling as if it was hanging in the air and this gives the taiji practitioner the feeling of weightlessness, called mǎn shēn qīng lì 滿身輕利. This feeling of weightlessness is not the result of an act of balance, this practice of balance is fully explained in Wikipedia: https://en.wikipedia.org/wiki/Head-ca....
The "dǐngtóu xuán"頂頭懸" sign usually appears simultaneously with the qì tiē bèi氣貼背 sign, which means that the part below the umbilicus sticks towards the spine. For details, please see my Amazon Kindle book, Acquiring the CranioSacral Postural Reflex of Tai Chi for Longevity and Enlightenment
   • Acquiring the CranioSacral Postural R...  
太極拳之“頂頭懸”出自王宗岳之《十三勢歌訣》：「滿身輕利頂頭懸」，頂頭懸解作頭之頂像懸在空中，所以滿身輕利，請不要誤解為頭頂物練平衡， 這練平衡法可參閱
https://en.wikipedia.org/wiki/Head-ca...
頂頭懸通常和氣貼背同時出現，詳情請看拙作，Acquiring the CranioSacral Postural Reflex of Tai Chi for Longevity and Enlightenment
   • Acquiring the CranioSacral Postural R...  
You might also want to read this Kindle book, The Dantian + Advanced Techniques please go to, https://www.amazon.com/dp/B09B7WJKDN
Introduction of this book: The abdominal Dantian is the most essential acquired physical feature for all advanced techniques in Tai Chi and meditation. A special sign, called 氣貼背qi tie bei was described by Master Wang 王宗岳 Wángzōngyuè（1771~1853 by estimation）. This sign indicates the strong suction of your Dantian. This is essential for the emergence of a new mode of slow breathing, called Taixi 胎息 Embryonic Respiration, which is the gate to advancement into Samadhi and rejuvenation. The author has an innovative explanation for its usage by the Daoists and the Tibetan Buddhists. Also, its role in the processes of 煉精化氣 (Liàn jīng huà qì) the sublimation of 精jing into 氣qi and 交而不泄Jiāo ér bù xiè, meaning having an orgasm without semen ejaculation are explained medically.
Contents:
1/ The Tai Chi CranioSacral postural reflex obtained from prolonged practice of Tai Chi and Chan (Zen in Japanese) meditation, called “氣貼背 qi tie bei”and “頂頭懸 ding tou xuan” p.6
2/ An attempt to explain王宗岳 Zōngyuè Wáng’s experiences of 氣貼背 qi tie bei, 頂頭懸 ding tou xuan: p.15
The YouTube video supplementing this book:
   • Introducing my new Amazon book, The D...  
Introducing my new Amazon book, The Dantian + Advanced Techniques
3/ If you are interested in Tai Chi and Qigong please keep the following advice in mind: p.19
4/Qi could be objectively observed as neurotransmitters: p.28
5/The circadian rhythm of the Nervous System as evidence of the operation of the Enteric Nervous system: p.40
6/ The Dantian anatomized: p.43
7/ Please look at the following pictures of most of the famous Tai Chi masters. p.48
8/ A scientific theory that explains why many famous Tai Chi masters are overweight: p.49
9/ A medical explanation why practicing Tai Chi can enhance health: p.74
10/ In ancient Oriental religious practices of Qigong the reproductive organs were closely related to rejuvenation. P.82
11/ The Dantian Breathing can produce negative pressure in the abdomen and the suction can facilitate blood circulation of the pelvic region as a whole and the prostate in particular, greatly reducing the extent of the problem. P.115
12/ Increase your mitochondria density by aerobic anaerobic exercises. The higher percentage (25% of the capacity of the organelle) the higher the metabolic rate for burning fat and providing energy. Pushing hand in tai chi is one way to both increase the density of the mitochondria and the neurotransmitters of the nervous system: p.117
Conclusion: p.130
Bibliography p.164
The supplementing YouTube video, "Introducing my new Amazon book, The Dantian + Advanced Techniques"
   • Introducing my new Amazon book, The D...