This is an excellent blog on the practice of Zhan Zhuang (WuJi Post Standing). The writer, Mark Cohen, is also the author of the book “Inside Zhan Zhuang” which  is a comprehensive exegesis on this method.  Mark is a long term student and teacher of Taiji & Qigong. He describes many essential details  that are necessary to establish a good physical (structural) , energetic and mental foundation to support health, longevity, internal martial power and mental/spiritual development, whatever your personal goals may be.