According to Jiang Yang's understanding of the information given by Xu Wenfeng, if you want to condense the true qi into Gang Qi, the first thing to do is to open up the second vein of Ren Du.

The two meridians of Ren Du are the dominant veins of the twelve canons, and the qi in the meridians, once overflowing, will flow into the two veins of Ren Du.

And the two veins of Ren Du are divided into yin and yang, and Ren is the sea of yin veins; Du Mai is the sea of Yang Veins.

That is to say, the yin and yang qi in the human body are dominated by these two veins.

Hence the practice of martial arts

Chapter 177 of "The Night Lasts Forever". Ren Du is the second vein, life and death! I am hitting it in my hand, please wait a moment,

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