According to the nine turn mental method left by Su Xuansheng in those years, theoretically speaking, even when practicing the first nine turn mental method, you can achieve the realm of internal breathing nine turn.

However, after countless tests, Chu Nan has determined one thing. No matter how many turns of internal breathing you have, you will eventually be limited by the upper limit of internal breathing that the meridians can bear.

Chu Nan has now reached the fifth level of the nine turn mental skill. With the strength of his meridians after repeated tempering, he can only bear all five turns of internal breathing, which helps his internal breathing to be strong enough to be comparable to the fifth level internal breathing warrior when it breaks out.

As for the six turns of internal breathing, Chu Nan had tried before, but he found that the strength of meridians was not enough to support for the first time, so he had to give up.

However, during this period of time, he has experienced various things. The strength of flesh * body has been significantly improved in all aspects, and the meridians have made a qualitative leap after introducing spatial energy. It is inferred from the data that it should not be a problem to bear six turns of internal breathing.

Once again, we are on the spaceship of laichu.

His mind moved, and the internal breathing was transferred out from the Dantian, flowing rapidly, and soon completed the five turns of internal breathing.

Then he didn't stop, continued to urge internal breathing and began to enter the state of six turns.

But as soon as the internal breathing was urged, Chu Nan immediately frowned.

There is no need to be reminded of the sharp pain of tearing from the meridians. It can be clearly felt only from the various data felt from the meridians that his meridians still can not withstand the too powerful six turn internal breathing.

Chunan is a little strange.

Whether from his own feelings or from accurate data, the strength and toughness of his meridians have improved significantly during this period. Why can't he bear six turn internal breathing?

Isn't it enough?

Chu Nan thought for a moment, still kept breathing and continued to urge.

Obviously much stronger than the five turn internal breathing, the six turn internal breathing completely flowed through the first meridian, but at the same time, it nearly completely destroyed this meridian, which made Chu Nan couldn't help shaking his body, bulging his cheeks and bleeding from the corners of his mouth.

Chu Nan looked around, quickly lowered his head, vomited the blood from his throat on his hands, wiped the corners of his mouth with paper, and sat down again as if nothing had happened.

After checking the internal breathing again, Chu Nan confirmed that the meridian had indeed been almost completely abolished.

However, this is not a big problem for him. He mobilized high-frequency vibration and internal breathing to cooperate with the inflammation of life to circle around the meridian for several times, and soon recovered the meridian as before.

However, when the meridians recovered, Chu Nan was surprised to find that although this meridians had obviously improved in strength and toughness compared with that just now, the improvement was very little. Even with his strong data ability, he could only detect extremely small changes, or even no changes.

Compared with the promotion after the channels were damaged and repaired every time when he forcibly broke through the three, four and even five turns of internal breathing, now this promotion can be regarded as nonexistent.

Such a tiny increase is certainly not enough to make this meridian strong enough to withstand six turns of internal breathing.

Chu Nan thought for a moment, urged the internal breathing again, reached five turns, and then continued to urge. This time, he changed a meridian experiment.

His body shook again and spit out a mouthful of blood again.

Then he continued to use high-frequency vibration breath and life inflammation to repair this meridian, and found that the improvement of this meridian was also very little.

Chu Nan tried several meridians again, and finally found that the improvement of repair after other meridians were damaged was still very small, which was far from being compared with him before.

The remaining meridians do not need to try again. Chu Nan can confirm that the meridians in his body have almost reached the limit after he has been injured many times and quenched with space energy, so it is impossible to have any significant improvement.

In other words, his meridians have almost reached the limit of human body in strength and toughness, and it is impossible to tap too much potential in this regard.

So how did the six turn internal breathing come from?

Chu Nan frowned deeply.

Su Xuansheng practiced jiuzhuan mental skill to the seventh level and successfully achieved the complete internal breathing jiuzhuan. Although no one after him also practiced jiuzhuan mental skill to the seventh level, some people still practiced to the sixth level, which means that at least the sixth level of jiuzhuan mental skill can be successfully practiced by others.

So how did they do it?

After thinking for a while, Chu Nan opened his personal terminal and began to watch carefully the nine turn mind method he had kept in his personal terminal.

After carefully reviewing the first five barycenter methods and comparing them with his own situation, Chu Nan confirmed that his previous cultivation should not deviate from the jiuzhuan mental method left by Su Xuansheng, and then began to carefully watch the sixth barycenter of the jiuzhuan mental method.

Compared with the first five barycentric methods, the introduction of the sixth barycentric method is much simpler.

The first five barycentric methods will tell you in detail the path of internal breathing flowing in the meridians, but the sixth barycentric method simply indicates that the martial arts who need to cultivate the sixth level should pay attention to the combination of internal and external, so that the internal breathing can be integrated with the flesh * body, and the flesh * body can be integrated with the universe, without too many clear instructions.

"In other words, my order is reversed? I have to break through the pass of the universe and heaven before I can break through the sixth level of the nine turn mind method?" Chu Nan frowned suspiciously and immediately shook his head to deny the idea.

Breaking through the sixth level of jiuzhuan mental skill is sure to break through the heaven pass of the universe. However, the jiuzhuan mental skill left by Su Xuansheng clearly states that the Ninth level of jiuzhuan mental skill is not directly related to the level of martial arts. If a martial arts player has enough talent, he can even understand the Ninth level of jiuzhuan mental skill when he is a martial arts player of internal breathing level.

Of course, he didn't break through to the seventh level until he became a Yutian level warrior.

As for the eighth and ninth? He didn't succeed until he became a star warrior and died.

"So this is just a realm understanding, which has nothing to do with one's own strength. So how can the sixth realm of six turns of internal breathing be reached? It has broken through the limit of the human body."

Chu Nan frowned and thought.

After a while, his expression suddenly moved and his eyes fell on the words "combination of inside and outside".

The flesh * body has limits, and the world outside the flesh * body has no limits.

Since the limit of flesh * body meridians can't bear six turns of internal breathing, don't let internal breathing complete six turns in meridians?

At first, Chu Nan thought that this idea was too whimsical, but after reading the sixth introduction of the nine turn mind method twice, she thought of some deeds about Su Xuansheng she had checked before. Combined with her own feelings, she felt that this idea was becoming more and more feasible.

Do whatever you want.

Chu Nan immediately mobilized the internal breathing, quickly completed the five turns of internal breathing, then let it out of the body and controlled the six turns outside the body.

However, at the beginning of doing so, the internal breathing has lost control and disappeared directly outside the body.

Chu Nan tried several times and all failed, which means that his idea is obviously wrong.

"So what does the combination of inside and outside mean?"

Chu Nan was thinking about this problem while urging the internal breathing to circulate outside the body.

Because every time he controlled the internal breathing outside the body to attract space energy, he unconsciously adjusted the internal breathing to the high-frequency vibration state again.

Feeling the space energy coming from all directions, Chu Nan suddenly moved in his heart.

"Maybe so?"

He controls the internal breathing to continue to maintain the high-frequency vibration state, so that it attracts spatial energy into the meridians and integrates with the internal breathing.

In general, these spatial energies will not leave anything after passing through his body.

However, this time, Chu Nan deliberately manipulated the internal breathing, guided these spatial energy to run round and round in the meridians, and urged the track of high rotation of internal breathing according to the nine turn heart method to flow together with internal breathing.

Soon, the internal breathing completed five turns. Then Chu Nan was pleasantly surprised to find that the spatial energy became much stronger with the internal breathing.

Chu Nan hesitated, urged the internal breathing to continue to operate, and began to try to circulate again.

The internal breathing with huge space energy flows again in the meridians.

However, this time, Chu Nan found that the meridians were not under any pressure and completed a week's operation in the meridians very smoothly.

Internal breathing six turns!

Realizing the strength after six turns of internal breathing, Chu Nan was happy, but he didn't stop doing it. Instead, he moved in his heart and continued to urge internal breathing. Unexpectedly, he began to try seven turns of internal breathing!

Internal breathing is combined with powerful spatial energy again and continues to flow.

Chu Nan was surprised to find that his meridians still didn't suffer much pressure and completed the seven turns of internal breathing very smoothly.

Then run again for a week to complete eight turns of internal breathing.

Then there was another day of the week.

Nine turns of internal breathing are achieved! (to be continued)