There have always been those who discuss boxing without discussing Qi, too. Though Qi is mastered whole, two types may be distinguished, namely “Exhalation & Inhalation.” Exhale & Inhale are also called Yin & Yang. Boxing cannot lack moving & stillness, Qi cannot lack exhaling & inhaling. Inhaling is Yin, exhaling is Yang, Yin is the master of stillness, Yang is the master of movement, Rising is Yang, Falling is Yin. Yang Qi ascends & becomes Yang, Yang Qi descends & becomes Yin. Yin Qi descends & becomes Yin, Yin Qi ascends & becomes Yang. This Yin Yang can also be divided. What is meant by “Clear & Turbid?” Rising & ascending are “Clear,” dropping & descending are “Turbid.” Clear Qi rises up, Turbid Qi sinks down. Clear is Yang, Turbid is Yin, & essentially, Yang nourishes Yin. When combined, its united as “Qi,” when divided it becomes “Yin Yang.” Qi cannot lack Yin & Yang, what are called people cannot lack movement & stillness. The nose cannot lack exhaling & inhaling, the mouth cannot lack exiting & entering. While this discusses the unchanging natural cycle, it is also scientific. That being the case, while Qi can be subdivided into two, in reality it is one. Those who are determined to study must be careful not to restrict this theory.