There is a kind of strength that is innate.
Chaos Demigods do not need to deliberately temper their bodies, for they are born with nearly invincible physiques.
Born with an invincible physique, this is why Chaos Demigods are said to have received the thick favor of Heaven.
Moreover, to Chaos Demigods, a powerful body is merely an accompanying feature; they are born with the will of the Great Dao and naturally possess a form of the Power of Tao, which is where their true strength lies.
Just like Jiang Chen, as a Chaos Demigod, his greatest strength is not surpassing the corporeal treasure of creation, but the Power of reincarnation that contains the Path of Reincarnation.
Having a beginning and an end, this is called reincarnation.
Reincarnation can evolve all things and also annihilate all things; it is nearly omnipotent, and this is the power that Jiang Chen possesses, close to all-powerful.
"Everyone, long time no see!"
