The sand iron grinding method is to dig a deep pit, bury rough sand iron around the pit, and then take a medicine inside, and then apply a kind of medicinal juice outside, and then hit the sand iron around the pit at the bottom of the pit to temper the skin film.

When practicing for the first time, the membrane is very easy to break, and the blood is stained, so you need to make up an extra amount of qi and blood dispersion, and gradually get better after repeating it many times, until it is rubbed in the sand iron pit, and the membrane is still undamaged, and it is gradually practiced.

"It's really much rougher than the gold and jade dermabrasion method."

Chen Mu said secretly in his heart.

If you go to dermabrasion in such a rough way, no matter how you have qi and blood to recuperate, and you have a decoction to protect your body, you will definitely leave a dark wound and a dark disease, which is not obvious when you are young, and you will have pain all over your body when you are old, but it is far inferior to the golden jade dermabrasion method.

Obviously, the efficiency of this kind of medicine powder is not as good as that of Jinyu dermabrasion method, and it is impossible to penetrate the medicinal power into the skin membrane by simply burying the sand and watering, and it must be supplemented by impact and sand iron training to produce results.

Just do what you say.

Chen Mu was very efficient, and quickly dug open the sand pit where he had practiced the Jinyu Dermabrasion Method before, put a deep pit of sand and iron, and prepared several boiled medicines, took off his clothes, and after applying it internally and externally, he jumped into the sand iron pit.

According to the booklet of the sand and iron dermabrasion method, when you first practice, you only practice for a quarter of an hour a day, until the skin gradually strengthens and begins to increase the time of tempering, until you become a small success, you can practice for one hour a day, and after you become a big one, you can practice for two hours a day.

For Chen Mu today, this kind of restriction does not exist.

His golden and jade dermabrasion method is perfect, and the strength of the skin film now, even if he has practiced the sand iron skin grinding method to perfection, it is at most similar to him, and the rough sand iron in the deep pit cannot cause any wear and tear to his skin film at all.

Chen Mu didn't care too much about whether the grinding was worn or not, he was a dignified man, and he didn't need to raise a body of ice muscles and jade bones, he only cared about the strength of his skin film now, and how efficient it was to practice the sand iron grinding method.

Soon.

After an hour of long practice.

Chen Mu felt the epithelia all over his body...... Nothing has changed.

Obviously, on the basis of the perfection of the golden and jade dermabrasion method, the effect of this iron grinding method has been minimal, and even if it is still effective, it is difficult to see any results without years of practice.

But Chen Mu didn't care about this, he directly called out the system panel, and sure enough, the system panel did not disappoint him.

【Iron grinding method (unfinished)】

[Experience: 27]

Although he didn't feel any effect, after an hour of training, he repeatedly applied the medicinal juice externally, and the experience points directly accumulated as much as 27 points, and Chen Mu didn't feel any discomfort at all now.

Obviously, with the strength of his current membrane, this hour's training is just sprinkling water.

"As expected."

Chen Mu showed a slight smile on his face, so he continued to boil and disperse, and continued to hone in the sand and iron pit.

After practicing like this for nearly four hours, I continued to apply the external medicine, and finally felt some numbness and discomfort coming from the skin membrane of my whole body, and I vaguely reached the limit of bearing.

When you call up the system panel again, you've accumulated a full 132 XP!

Chen Mu jumped out of the deep pit, and after a short rest, he consumed experience points and directly improved the iron grinding method to Xiaocheng!

Airplanes!!!

It was as if after two or three months of training accumulated in the sand and iron pit, it exploded at one time, and there was also a heat wave in the body that exploded, constantly rising, and spreading to all parts of the body.

This is different from the elevated gold and jade dermabrasion, which is more like a 10,000-needle hairpin thorn, and this method feels like a rough sand iron rubbing hard in every part of the body.

It's just that for Chen Mu today, the feeling of friction is not very painful.

There is even a faint sense of comfort.

After all, compared with the lifting process of the Jinyu dermabrasion method, the degree of pain is completely incomparable, which is also the reason why the resistance of the whole body is greatly improved after having the perfect foundation of the Jinyu dermabrasion method.

A moment later.

The surging qi and blood in the body returned to stability.

Chen Mu clenched his fists, this time he finally felt a slight change, the sand iron dermabrasion method was small, superimposed on the perfect golden jade dermabrasion method, and it still had a little effect, making his skin membrane a little stronger.

"Very well, it seems to be in the right direction."

In just one day, the sand iron dermabrasion method has been practiced to a small level, or on the basis of practicing a dermabrasion method to achieve perfection, if this is said, I don't know how many people's jaws will be shocked.

But this is reasonable for Chen Mu, because with his current skin film strength, he can resist the cultivation of the sand iron grinding method for five hours in one day, and the strength itself is full, and the medicinal juice that has been repeatedly applied externally in these five hours has been converted into experience points by the system panel.

This in itself is the medicinal power that ordinary people need to spend two or three months slowly practicing before they can slowly absorb it.

It was nearly late at night.

Chen Mu did not continue to practice, and after washing, he returned to the house to rest.

At dawn the next day, I started the practice of the sand iron grinding method again, this time for a longer time, except for the time to eat and rest halfway, I practiced the skin film for six hours, counting the rest before, and accumulated nearly 200 experience points.

Day 3.

After four hours, the sand iron grinding method is complete!

Chen Mu's appearance has not changed much since he practiced the Golden Jade Dermabrasion Method, but with the completion of the Grinding Iron Dermabrasion Method, his complexion has finally become a little darker, with a hint of bronze luster.

And just as Chen Mu expected, he also repaired the dermabrasion method not only will not do half the effort, but with the gradual enhancement of the skin membrane and faster and faster, the sand iron dermabrasion method only takes three days from small to large, and from the great to the full, it only takes five days!

At this time.

Chen Mu was dressed in a skin mask, with a deep complexion and a thick bronze color, very similar to the kind of copper and steel skin possessed by Squire Zhang's son, and he used a slightly blunt kitchen knife to cut through his arm, leaving only a white mark.

"Even if it is not as good as that person, at least it is at the level of nine points, and the qi and blood in the body have further become stronger, although the increase in pure strength is not large, but the physical strength has doubled compared to before."

Chen Mu sighed.

Martial arts fighting, when the realm is low, the fight is a courage, the brave wins when the narrow road meets, and when the realm gradually goes up, the competition is more essential, who is more resistant to fighting, who is more refined in swordsmanship, whose strength is more abundant, and the physical strength is longer!

The two dermabrasion methods are complete, and when superimposed, they bring not only resistance, but also more physical strength, which means that after he enters the meat training level, the explosion will be more durable.

What is the limit of membrane strength?

Chen Mu quickly found the answer to this question.

Because when he found the third 'coarse salt dermabrasion method', in just seven days, after practicing to perfection, the qi and blood in his body were vigorous like a flame, which had reached the limit that his current body could bear, and the strength of the skin membrane was the same.

After the completion of the sand and iron dermabrasion, his skin turned a deep tan, but after the coarse salt dermabrasion was practiced, the complexion was gradually whitened, and finally returned to the original wheat color, or even lighter.

"Copper and steel skin."

Chen Mu felt the strength of his skin and couldn't help but smile.

For ordinary people, either they are talented, or they have to spend more than a few years to have the opportunity to practice such a copper and steel skin, but here in him, in less than a month, the feats are complete!

If you have to say it, this level should be the limit of the grinding realm, compared to the kind of innate copper skin is no worse than that, and even in terms of the vigor of qi and blood, maybe he is even stronger!

"When the skin is perfected, I can withstand the load brought by the realm of meat training and the sudden increase in muscle strength, so with my current copper and steel skin, once I enter the level of meat training, the power I can carry is bound to be much stronger."

Chen Mu took a deep breath.

Slowly took out a booklet from the bedroom.

"Mangniu Meat Training Method"

This is what he asked Min Baoyi to come three days ago, although he can also ask Xu Hongyu for it, but with Min Baoyi, a character who has completed meat training, there is no need to go far and near, it is nothing more than to find a suitable reason.

In fact, Min Baoyi didn't care about Chen Mu's reason at all, and when he heard Chen Mu say that he wanted to study the method of meat training in advance, he casually agreed, and the next day he brought this meat training method and handed it to Chen Mu, which was more casual than Chen Mu expected.

Obviously, for a character like Min Baoyi, there is nothing unusual about practicing meat, and Chen Mu is the person Xu Hongyu wants to cultivate.

But.

When handing over the meat practice method to Chen Mu, Min Baoyi still warned him, saying that unless the skin grinding has been practiced to perfection, don't rashly start the practice of meat practice, because of the relationship between the levels of progression, the skin grinding has not yet been perfected to practice the meat practice, and all of a sudden the skin and flesh are combined, and then it is more difficult to grind the skin in turn, and it will directly affect the meat practice method and cannot be practiced to perfection.

Dermabrasion is the foundation of meat training, and meat training is also the foundation of subsequent tendon and bone forging.

And this also made Chen Mu realize that he may be very correct in training a copper and steel skin, because if there is a limit to training meat, easy tendons and forging bones, then every step can fully give full play to the advantages of the system panel.