When a warrior practiced the arts, he would attempt to clear his meridians after his body was completely trained. It was the first step on the path of martial arts.
A human’s channels consisted of twelve regular meridians and eight special meridians.
The twelve regular meridians spread throughout a person’s limbs. They were the three arm yin meridians (lung, pericardium, heart), three arm yang meridians (large intestine, triple burner, small intestine), three leg yang meridians (stomach, gall bladder, bladder), and three leg yin meridians (spleen, liver, kidney).