As the strands of filth in the middle dantian were cleared out, Zhu Wuwan could clearly feel that her various physical qualities were beginning to improve.
The middle dantian was connected to every part of the cultivator's body. The surrounding filth naturally affected the cultivator's body. It was the impurities and filth in the cultivator's body.
As these impurities and filth were cleaned out, the cultivator's physical fitness and talent would naturally improve. It was just like how Zhu Wuwan felt that his spiritual intelligence was becoming more and more unobstructed during the process of cleaning up the filth in his Niwan Palace.
Even Zhu Wuwan's body became more relaxed. When she used all kinds of movement techniques and footwork, she would become more proficient.
Moreover, in the process of using the Primordial Dao True Qi to clean up the filth, the Primordial Dao True Qi was also tempered and honed, becoming purer and stronger.