In Yan Liqiang's previous life, he wasn't a great swimmer, but he knew how to swim well enough like an average person. At the start of this life, he was also an average swimmer. What really shaped him into an excellent swimmer was the time he spent practicing spear shaking underwater during his time in Deer Villa at the Imperial Capital.
In order to perform spear shaking underwater without drowning, he first had to learn how to hold his breath. At first, Yan Liqiang wasn't able to hold his breath for a long time. After staying underwater for a long time, he gradually learned to hold his breath and eventually for a longer period of time.
To perform spear shaking under a violent waterfall while being hit by the changing water current due to spear motions, he also learned how to hold his breath while maintaining his balance in water by perceiving the changes in the water current.
