Taoism is the ancient Chinese philosophy that is the backbone of Tai Chi and Chi Kung practice.
The principles laid out in works such as the Tao Te Ching are applied to our movements, resulting in harmony and relaxation.
Concepts like Yin and Yang are seen frequently in these movements, illustrating how the Yin (regressive, quiet) and the Yang (aggressive, bold) co-exist.
Each movement contains both Yin and Yang aspects, and by studying them we come to a greater understaing of how our bodies work most efficiently.
Taoism can also serve as a great life philosophy, no matter your current religion or beliefs. It is predicated on achieving harmony with the world around you, not wasting energy on frivolous affairs, and seeking peace and balance in our daily lives.