Ever since humans learned to cultivate, countless predecessors have tried to strengthen the weak human body with spiritual power, making it comparable to fierce beasts.
Even ordinary people who do not know how to refine equipment will adopt some techniques to strengthen their bodies. As for body refining methods, there are innumerable ones.
However, general body refining methods are only for training the skin and bones. A stronger method will strengthen the muscles and blood vessels. A higher level of technique begins to take the inner Saint and outer King path, strengthening the five internal organs and six viscera.
Should a body training method be able to refine the blood and marrow, it would be considered top-notch in the world. If one possessed such a method and diligently studied it, they are certain to achieve greatness in the future.
