The basis is that Liu Yun discovered it in martial arts practice, and adopted corresponding exercise methods, and achieved good health-keeping effects.

According to Sohu's query. Com, the scientific basis of Liu Yun's immortality was discovered by Liu Yun in practice, and he took corresponding exercise methods and achieved good health preserving effect. Liu Yun's culture is not high, and he can't dress himself up with mysterious words, so he claims that he can drag his life back and rejuvenate himself.

This formulation is ok. For the sake of hype, it is suggested that this achievement method is immortal, which is also the reason for the failure. Through this method, we can prolong life, reduce aging and achieve health.