This body was so frail, it was almost unimaginable. He was certain he had returned to the age of fifteen, just the day he was about to begin his cultivation.,Humans begin their cultivation journey from the mortal realm, refining their flesh and blood, honing their bones and sinews, tempering their skin.,Before the age of fifteen, the meridians and internal organs in a human body are not yet fully formed, making them more vulnerable and less suitable for cultivation.。