Why is Hidan immortal in "Naruto"?

The reasons for Hidan's immortality in "Naruto" are as follows:

Hidan's abilities are related to the soul. Due to Hidan's special system, the body and soul are extremely strong. Due to the synchronization rate, Hidan cannot die like a normal person, which is a bit like reincarnation. By cultivating chakra to ensure that the body does not die, and by fixing the soul through the ultra-high synchronization of the soul, this is the secret of Hidan's immortal body.

Introduction to Hidan's abilities in "Naruto":

After obtaining immortality, Hidan learned a forbidden technique "Death by Blood". This forbidden technique can be obtained again After absorbing the enemy's blood, he lets the enemy's blood flow into his own body, and then injures himself so that the enemy suffers the same damage.

Originally, this is a forbidden technique that will lead to death, but since Hidan is immortal, he can use this forbidden technique at will. So since Hidan's immortal body and Shi Si Ping Blood is so special that it even makes them somewhat invincible, but there are a few people in Naruto whose physiques can completely ignore Hidan's death with blood.