"Although there is no obvious movement, they are deeply engaged in one of the most demanding and powerful forms of exercise ever developed. It is so utterly focused on deep, internal growth that it literally requires learning to stand like a tree. It is known in Chinese as Zhan Zhuang, "standing like a stake', or "standing like a tree." It is pronounced "Jan Jong", or in southern China, "Jam Jong"."
- Mater Lam, Kam Chuen, The Way of Energy, p. 11
“In esoteric training conditions, before beginning the movements of Tai Chi Chuan, a person first practices standing meditation. Beginning in stillness embodies the classic Taoist notion that energy comes from the void, or the mother of Qi, called Wuji, and that the movement of opposites, like yin and yang, are born of non-movement. It also reflects the central notion of cross-cultural healing traditions that “healing derives from returning to the origin of things.”
- Michael Mayer, Secrets to Living Younger Longer, 2004, p. 25
"Standing Meditation is the single most important and widely practiced form of gigong, integrating all elements of posture, relaxation, and breathing previously described. It is a way of developing better alignment and balance, stronger legs and waist, deeper respiration, accurate body awareness, and a tranquil mind."
- Kenneth S. Cohen, The Way of Qigong, p. 133.
http://www.egreenway.com/taichichuan/wuji.htm