Dr. Peking University and Xingcheng Zhang Zhiyuan talk about health preservation. Dr Peking University, the first postdoctoral fellow in Huangdi Neijing, talks about health preservation. Zhang Zhiyuan, a famous expert in traditional Chinese studies, a health expert, a Chinese medicine culturist, a calligrapher and an advocate of traditional Chinese studies, said that being a smart and confused person is the greatest pressure.