The Ancestor of Physical Cultivation

In the Immortal Cultivation World, everyone knew how terrifying body cultivators were. Their bodies were as strong as magical treasures, and their punches and kicks were filled with terrifying brute force. Their combat power was astonishing.So how did the first body cultivator appear in the early days of the Immortal Cultivation World?In the cultivation system of the weak Golden Core and Nascent Soul, how was the Body Refinement Method created?This was a story about the ancestor of body cultivators who created the Body Refinement Method.