Exercises that incorporate twisting, turning, screwing, whirling, bending, undulating, sinking down and rising up, wiggling etc. are often associated with the natural movements of snakes, serpents and thus dragons. Many Qigong forms, sets and specific Qigong movements have been called "Dragon" forms , sets or exercises.
In Chinese thought and as understood by Daoists, the invisible life force, qi, pervades the entire universe, Heaven and Earth, and everything is interconnected by it. As the key attribute of nature is changeability, or transformation, so the flow and change of qi takes place according to the changes occurring between the two seemingly opposite but complementary energies, Yin and Yang.
Being the people of the so-called Western world, we live in a world of dualisms that entail judgments and evaluations, followed by our reactions. Active - passive, strong - vulnerable, success - failure, generous - selfish, black - white. In every situation, if one thing represents good for us - then the other represents evil.