1. Concept: The body of pure yang is an ideal state mentioned by Taoism, which means that the yang in a person's body is extremely strong and almost unaffected by yin. In Taoist view, the body of pure yang is the highest state of health cultivation, which can achieve the purpose of prolonging life and immortality. Extreme yang refers to a person's strong yang, but it is not completely unaffected by yin. The body of extreme yang is considered to be a relatively healthy constitution in the theory of yin-yang and five elements, but compared with the body of pure yang, the balance between yin and yang is low.

2. Application: In Taoist practice, the body of pure yang is considered as the highest realm of practice, which means that the practitioner has reached the realm of harmony between yin and yang, smooth qi and blood, and no disease. In real life, people use the body of extreme yang to describe a person's state of vigorous yang and good health. In practical application, the body of extreme yang is more used to describe a person's physique and health, rather than the realm of cultivation.