Tai chi philosophy comes to us from the Daoist and confucians. The Daoists in particular were particularly concerned with harmonising their individual and social functioning with natural patterns. They would spend much time in reclusive environments observing nature and contemplating how things worked, particularly the interconnected nature of things.
Tai Chi theory was born out of these types of observations and these types of deeply contemplative thinkers. Elegant solutions were found to the health building and fighting problems of the day.
In essence tai chi chuan is about understanding Yin and Yang dynamics in a practical way to solve health/fitness problems and martial/defence scenarios.
For example some movements are expansive by nature and others contractile. By refining the coordination of this process we can make out movements and techniques more potent.
Against an opponents attack (Yang) it is far more safe and effective to use minimal force (evade or divert -Yin) to defeat the attack and then immediately counterattack the closest vulnerable vital point (Yin) with our most powerful and potent weapon (Yang). This type of concept has to be practiced continuously and with awareness until it becomes instinct.
If we are stiff, tight or stressed we can use more Yin training. If we lack power or strength then perhaps a period of Yang focused training will be wise.
