Day after day, the mountains behind the Lian clan are full of Yi Yun's footprints.

Yi Yun practiced barren bones at night, peeked at the warrior reserve camp in the morning, and then practiced in the back mountain all day, only at dusk, did he go home and take a nap for an hour.

Yi Yun cultivated so hard, and his strength also improved by leaps and bounds.

The back mountain is far away from the medicine mountain, and it is far away from the tribal village, so no one usually comes at all, no one is there during the day, and there is not even a ghost shadow at night, Yi Yun practices here without worrying about being seen at all.

Fifteen days later-

"Drink!"

Yi Yun roared, his body flew out like an arrow, and the ten-meter-high mountain rock, Yi Yun jumped up!

The wind was whistling in his ears, and the bones of Yi Yun's whole body exploded, like a tiger roaring and a dragon roaring!

"The Tiger is coming down!"

Yi Yun's body tensed, he brought his legs to his waist, and his back transmitted the power to his arms, and smashed it out with a punch!

"Buzz!"

A clear trilling sound came out of Yi Yun's body, like a strong bow pulling, this was the collapse of Yi Yun's tendons! Compared to Yao Yuan that day, the sound was even stronger!

"Click!"

In front of Yi Yun, a large stone one foot square was smashed by him with one punch!

Cobweb-like cracks all over the stone!

This is not an ordinary rock, but a black iron rock, which is much harder than ordinary stones, but today, it was smashed by Yi Yun's punch.

"Puff puff!"

In the jungle, the birds that had already roosted in the jungle were so frightened that they flew away, and the insects that were chirping and the frogs that were cooing in all directions were all frightened!

For a while, there was silence in the mountains and wilderness, only leaves and bird feathers fell and landed on Yi Yun's head and shoulders.

Thunder Yun nine clouds, frightened bow and flying geese!

My punch has already reached this realm!

Now the moment Yi Yun's whole body strength exploded, it was true that the bones exploded and the thunder was faint, but as for the frightened bow and flying geese, it was only possible for the injured lone goose to be possible, otherwise even if it was a nine-stone strong bow, there would be no way to scare the wild goose down.

Moving his body at will, Yi Yun's bone joints made a "click" sound again, his current bones are like a hundred refined iron, and his tendons are really like the dragon tendons that hold a strong bow!

"My current realm has already been completely consolidated, and I can try to open up the meridians and enter the realm of the mortal blood fourfold meridians in one fell swoop!"

The human body has meridians, but ordinary people have meridians that are not connected and cannot form a circulation, so they cannot be used to contain the vitality of heaven and earth.

Martial artists practice martial arts, and after the body is tempered, they must open up the meridians and prepare for truly embarking on the path of martial arts.

The meridians of the human body are divided into 12 meridians and 8 meridians.

The 12 canons all pass through the limbs, namely the three yang meridians of the hands, the three yin meridians of the hands, and the three yang meridians of the feet and the three yin meridians of the feet, a total of 12 articles.

The eight veins of the Qi Jing are all over the body, and the two most important meridians in the eight veins of the Qi Jing are the two veins of Rendu.

The position of the two veins of Ren Du is on the central axis of the person, and it is a straight line from the front.

Among them, the Ren pulse is in the front, and the Du pulse is in the back, and the two lines form a circle along the central axis of the human body, passing through the dantian and perineum, and covering the human body in it like two ropes enclosed under the crotch.

If there is a broken pulse between the two veins of Rendu, the second vein of Rendu will be opened, and the broken veins will be continued, then the energy of the human body will form a perfect and closed circle along the central axis, so opening up the second vein of Rendu is a key step to open up the meridians of the whole body.

Among the martial arts novels that Yi Yun has read, there are many plots about opening up the second line of Ren and Du.

For example, Zhang Wuji's practice of the Great Shift of Qiankun opened up the entrance of the whole body, and Xuzhu opened up the meridians when he accepted the inheritance of Li Qiushui and Tong's grandmother's internal force, and so on.

Including ancient medical books, there are also many records of opening up the two veins of Ren Du, and the two veins of Ren Du can be reborn and greatly increase their skills.

The perfect closure of the meridians will also pave the way for future martial arts cultivation to a higher realm.

Yi Yun sat down cross-legged and began to use the energy accumulated in his body to impact the meridians!

As long as the meridians are connected, Yi Yun's strength is basically the same as the peerless master in martial arts novels.

If it is in ancient China, it is completely possible to fly the eaves and walk the wall, be happy and revenge, and take the head of the enemy general with thousands of troops and horses.

There are two ways to get through the second vein, one is to rely on external help, and the other is to rely on oneself.

In biographical novels, there are peerless masters who spend their efforts to open up the second pulse of Ren Du for the protagonist, which makes the protagonist increase his strength overnight, which is also the so-called "passing on the gong".

Although this kind of practice is fast, it is not the right path after all, and it is not as solid as one's own cultivation.

Yi Yun naturally chose the second way, that is, to open up the meridians by himself.

In the "Dragon Muscle and Tiger Bone Fist", it is recorded that there is a method to open up the meridians, sit cross-legged on both knees, and every breath is as deep as possible.

After the martial artist reaches the third layer of mortal blood, he inhales the breath in his body, and then mixes the energy originally accumulated in his body, and the two are superimposed, flowing in his body like a stream of fire!

Yi Yun consciously led this energy to the dantian and compressed it here!

Again and again, the energy in Yi Yun's whole body slowly converged, and he breathed faster and faster, inhaling deeper and deeper.

Absorb the essence of the sun and the moon, and breathe in the vitality of heaven and earth!

If someone was not far away at this time, he could see a faint layer of light on Yi Yun's body.

Especially on Yi Yun's chest, there was purple light condensing, gradually spreading throughout his body.

This is the light of the origin amethyst when absorbing the vitality of heaven and earth, when Yi Yun crosses his knees and exhales, the amethyst in his heart also absorbs the energy between heaven and earth with Yi Yun, assisting Yi Yun to make the final impact.

Slowly, the purple light on Yi Yun's body became more and more abundant, this purple light was just like the purple qi coming from the east in ancient Chinese legends, it was the image of a saint!

The energy was superimposed again and again, and in Yi Yun's body, the sound of a tiger roaring and a dragon's groan came out, and the blood flow in his body was like a surging river, galloping endlessly!

Breathing again and again, the airflow around Yi Yun rotated rapidly, like a long whale sucking water, and the momentum was amazing.

"Whew-Whew-Whew-"

Yi Yun's breathing became heavier and heavier, and with each breath, his body swelled, as if his body was like a boat on the waves, rising and falling.

And in such ups and downs, the strength of Yi Yun's whole body is constantly condensing and condensing.

The tendons in the body make a bowstring-like sound, the tough skin membrane is like a cowhide that has been blown up, and the bones make a popping sound like fried beans.

When all this accumulated to the extreme, Yi Yun felt that his body was about to explode, and he controlled the condensed power, together with the heat flow he inhaled into his body, rushing into the dantian one by one, wave after wave, like the angry waves that beat the reef!

When Yi Yun felt that he had reached the limit, and the small blood vessels on his body surface began to burst, he only heard a "boom" explosion, with Yi Yun as the center, the energy completely burst out, and the rock that Yi Yun was sitting on directly collapsed, and the shrubs and small trees within five meters of the vicinity were all destroyed!

Yi Yun's whole body collapsed, and his nostrils and ears were bleeding outward, but this blood was not blood, but black blood, including the pores on Yi Yun's body, and some gray sweat flowed out.

It's done.

The four layers of blood - meridians!

Yi Yun knew that he had finally opened up the meridians of his whole body, officially entered the realm of the four meridians of mortal blood, and became a character equivalent to the hero of martial arts novels.

When Yi Yun was reading martial arts novels, he also longed to be a chic chivalrous man, who could fly the eaves and walk the wall, act chivalrous and righteous, and be happy and revengeful.

And today, I really have such strength.

However, in this other world, the energy is much richer than that of the earth, and if the earth opens up the two veins of Ren and Du, he is already a peerless master, probably because there is no so-called "heaven and earth vitality" on the earth.

And here, there is not only the vitality of heaven and earth, the power of the wilderness, the spiritual power, but also all kinds of mysterious powers that Yi Yun has never understood at all, and the power is as exaggerated as the nuclear energy on the earth.

This power can be used for one's own use, so the four-layer meridian realm of mortal blood is just the beginning of martial arts.

Yi Yun jumped up from the ground, he looked around, his perception was clear again, within ten steps, the sound of the wind blowing grass blades, and the sound of small insects burrowing were all clear.

He even counted the number of fallen leaves on the surrounding grass at a glance, a total of thirty-two!

With clear perception and sharp thinking, many martial arts masters can never forget it, and it is also because the meridians of the whole body are connected, and the brain power has also made great progress!

You must know that the circulation of the second pulse of Ren Du passes through the brain, and the energy runs through the brain, so people's memory is naturally strong and their reactions are much more agile.

"Cool, so cool!"

The changes in his body made Yi Yun very happy in his heart, he had perfectly broken through the realm of the four meridians of mortal blood, not only that, but he once again used the breakthrough to wash the essence and cut the marrow.

Mortals eat whole grains, there are many impurities in their bodies, and before they reach the purple blood realm, they must wash the essence and cut the marrow.

This washing essence and marrow, naturally the more thorough the better, Yi Yun has now washed his body twice, and the filth washed out is less than once.

Yi Yun directly stripped naked, jumped into the deep pool to take a bath, he dived into the deep pool for a hundred or ten meters in one go, and held his breath underwater for twenty minutes before swimming out.

"Poof!"

The water splashed open, and Yi Yun jumped onto the boulder like a big carp!

He was naked, and he didn't have a change of clothes, so Yi Yun put the old clothes that had just been washed on his body with water.

This coarse cloth clothes were stained with water, wet, and completely attached to Yi Yun's body, showing the perfect lines of Yi Yun's body.

After these days of hard training, Yi Yun's muscles have become stronger and stronger, his body has become more and more fit, and he has grown a few points taller, more and more like a handsome young man.

Especially at this time, Yi Yun broke through the meridian realm, and his overall feeling was different.

He stood on top of the boulder, his body like a sword unsheathed, fierce and outstanding, and the soft moonlight sprinkled down, shining on Yi Yun's delicate skin, like sliding mercury.

Where is such a teenager still like a poor child who can't get enough to eat?

He was like an uncarved piece of jade, but it had already revealed a beautiful luster, and the coarse cloth clothes that could almost be described as "ragged" could not hide his glow at all.