During the Song and Yuan Dynasties, there appeared many health-preserving monographs, such as Collection of Health-preserving Categories and Health-preserving Monthly Notes, Qian's Monthly Order, Liu's Poem of Mixing Custom and Prolonging Life, Yugu's The First Essentials of Prolonging Life, Jiang Yue's Health-preserving Monthly Notes, Wei Hanggui's Health-preserving Monthly Notes, Sanyuan Counselor's Life-prolonging Letter, and Wang Ning.