According to the Nine-Turn Mind Method left by Su Xuansheng back then, theoretically speaking, even when he only practices the first level of Nine-Turn Mind Method, he can reach the state of Nine-Turn internal breath.

However, after countless experiments, Chu Nan determined something. No matter how many internal breaths you turn, it will eventually be limited by the upper limit of internal breath that the meridians can withstand.

Chu Nan has now practiced to the fifth level of the Nine-Turn Mind Method. With the strength of his meridians after repeated re-tempering, he can only bear all the five internal breaths, which helps his internal breath to be as powerful as the fifth-level internal breath warrior when it explodes.

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

However, during this period, he experienced various things, and the strength of the flesh body has been significantly improved in all aspects. The meridians have also achieved a qualitative leap after introducing space energy. From the data, it should be no problem to bear the six-turn internal breath.

Now that he has nothing to do on the spacecraft, Chu Nan has begun to make another attempt.

With a thought, his inner breath was pulled out from his dantian and flowed rapidly, and he quickly completed the five revolutions of his inner breath.

Then he did not stop and continued to activate his inner breath and began to enter the six-turn state.

But as soon as the inner breath was activated, Chu Nan immediately frowned.

There is no need to remind you of severe pain like tearing from the meridians. Just by just the various data sensed from the meridians, it can be clearly felt that his meridians still cannot withstand the too powerful six-turn internal breath.

Chu Nan was a little strange.

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

Is it not improved enough?

Chu Nan thought for a while, but still kept circulating internal breathing and continued to activate.

The sixth-turn inner breath, which was obviously much stronger than the five-turn inner breath, flowed through the first meridian intact, but it also almost completely destroyed this meridian, making Chu Nan unable to help but shake his body, bulging his cheeks, and a stream of blood flowed out of the corners of his mouth.

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

After re-engaging the internal breath and checking it, Chu Nan confirmed that the meridian was indeed almost completely abandoned.

However, this was not a big problem for him. He mobilized high-frequency vibration internal breathing and combined with the life flame to circle around the meridian for several times, and soon restored the meridians to the same as before.

However, when the meridians recovered, Chu Nan was surprised to find that although this meridian obviously improved in strength and toughness compared to the previous one, it improved very little. Even with his powerful data ability, he could only detect extremely small changes, which could even be equivalent to none.

Compared to the improvement of his forced breakthroughs in the three internal breath rotations, four or even five revolutions, the improvement after each time the meridians are damaged and repaired, now this improvement can be regarded as non-existent.

Such a slight improvement is certainly not enough to make this meridian sufficient to withstand the internal breath of the six revolutions.

Chu Nan thought about it, activated his inner breath again, achieved five revolutions, and then continued to activate it, but this time he changed his meridian experiment.

His body shook again and he spat out a mouthful of blood again.

Then he continued to use high-frequency vibration internal breath and the flame of life to repair the meridian, and found that the improvement obtained by this meridian was also minimal.

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

The remaining meridians do not need to be tried again. Chu Nan can confirm that the meridians in his body have been repaired after he suffered multiple injuries and have almost reached their limit after using space energy to temper them. It is completely impossible to have any significant improvement.

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

So how did the six-turn internal breath come from?

Chu Nan frowned deeply.

Su Xuansheng practiced the Nine-Turn Mind Method to the seventh level and successfully achieved a complete nine-turn inner breath. After him, although no one practiced the Nine-Turn Mind Method to the seventh level, there were still people practicing to the sixth level, which means that at least the sixth level of the Nine-Turn Mind Method 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 carefully observe the Nine-Turn Mind Method that he had always kept in the personal terminal.

After carefully reading the first five levels of mind method and comparing it with his own situation, Chu Nan confirmed that his previous practice should not deviate from the Nine-Turn Mind Method left by Su Xuansheng, and then he began to carefully observe the sixth level of Nine-Turn Mind Method.

Compared with the first five centers of the center of gravity, the introduction of the sixth center of gravity is much simpler.

The first five core methods will tell you in detail the trajectory of inner breath flowing in the meridians, but in the sixth core method, it simply shows that warriors who need to practice to the sixth level pay attention to the combination of internal and external, so that the inner breath and the flesh and body are fusion, and there is no clear indication.

"In other words, I have to go against the order? I have to break through the universe before I can break through the sixth level of the Nine Turns Mind Method?" Chu Nan frowned in confusion, then shook his head and denied this idea.

After breaking through to the sixth level of the Nine-Turning Mind Method, you can definitely break through the universe and heavenly gates, but the Nine-Turning Mind Method left by Su Xuansheng clearly stated that the level of the Nine-Turning Mind Method is not very direct related to the level of the warrior. If a warrior has enough talent, he can even understand the ninth level of the Nine-Turning Mind Method when he is an inner-level warrior.

Of course, he himself did not successfully break through to the seventh level until he became a warrior of the Heaven level.

As for the eighth level and the ninth level? He failed to break through until he became a star-level warrior until he died.

"So this is just a realm understanding, and it has nothing to do with one's own strength. So how can we achieve the sixth level of the sixth level of internal breath change? This is breaking through the limits of the human body."

Chu Nan frowned and thought.

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

There are limits for the body of flesh, but there are no limits for the world outside the body of flesh.

Since the limit of the body's meridians can no longer bear the six-turn internal breath, then don't let the inner breath complete the six-turn internal breath in the meridians?

Chu Nan initially thought that this idea was too whimsical, but after reading the introduction of the sixth level of the Nine Turns Mind Method twice, thinking about some of the deeds about Su Xuansheng that he had checked before, combined with his own insights, she felt that this idea was becoming more and more feasible.

Do it when you think about it.

Chu Nan immediately mobilized his internal breath and quickly completed the five revolutions of his internal breath, then penetrated it out of his body, controlling his six revolutions outside his body.

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

After Chu Nan tried several times, all failed, which meant that his idea was obviously wrong.

"So what does it mean to combine inside and outside?"

Chu Nan was thinking about this issue while urging his inner breath to flow outside his body.

Because every time he controlled the inner energy outside the body to flow, he was to attract spatial energy, so he unconsciously adjusted the inner energy to a high-frequency vibration state again.

Feeling the energy of space coming from all directions, Chu Nan suddenly felt a sense of emotion.

"Maybe this is possible?"

He controlled the inner breath to continue to maintain a high-frequency vibration state, attracting space energy into the meridians and fusing with the inner breath.

Generally speaking, these spatial energy will only pass through his body for a while and nothing will be left behind.

However, this time Chu Nan deliberately controlled the inner breath, guiding these spatial energy to circulate round after round in the meridians, and according to the Nine-Turn Mind Method, the trajectory of the inner breath is activated and the flow is carried out together with the inner breath.

Soon, the inner breath completed five revolutions, and then Chu Nan was surprised to find that the space energy actually completed five revolutions with the inner breath, and it became much stronger just like the inner breath.

Chu Nan hesitated for a moment, activated the internal breath to continue running, and began to try to flow again.

The internal breath, wrapped in huge space energy, flowed again in the meridians.

However, this time, Chu Nan found that the meridians were not under any pressure and completed the cycle of operation in the meridians extremely smoothly.

Six turns of internal breath!

After realizing the strength of the inner breath after the six revolves of inner breath, Chu Nan was happy, but did not stop and act. Instead, he moved his heart and continued to activate the inner breath. He actually started to try the inner breath for seven revolves!

The inner breath is once again combined with the powerful space energy and continues to flow.

Chu Nan was surprised to find that his meridians were still not under much pressure, and he completed the seven internal breathing revolutions extremely smoothly.

Then run again for one day and complete the eight internal breath rotations.

Then another week later.

Nine turns of internal interest are achieved!
Chapter completed!