The standard stretching routines in the traditional Wudang schools demand high flexibility to improve ones internal power. Being flexible puts less strain on the body and relaxation becomes more efficient. This will prevent injury and establishes freedom in the mind. Freeing oneself from physical and mental blockades to prevent stagnation of energy.
The spelling Chi Kung (Wade & Giles) is outdated and was developed as a transcription around 100 years ago in Cambridge. Today we know how Chinese people emphasize and the current romanization is called Pinyin. It is also called Tai Ji instead of Tai Chi.