C454 The Hidden Figure of the Robles Family

"But how do I practice this?"

Elmer asked. The theory was easy to understand, but it was very difficult to do. How could he control his strength? And what was this technique?

"The covert force is not like the Clear Force, which can be purely explosive."

Mordeni said, "If you want to use the covert force, you have to be very familiar with the control of the Genuine Qi. After all