The winter night was silent, his body was still driven by a strong spirit, and he continued to move forward step by step, his speed did not know when it began to slow down too much, and it could be called snail speed in simple comparison.

And how long did it last? The winter night didn't know, all he knew was that when his spirit began to flicker, he forced himself to stop his madness.

His body swayed, and the occasional breeze on the shore put a lot of pressure on him, and he felt like his body would fall at will.

Holding on to his body, which had been exercised to the true limit, he tried to keep his eyes wide open, standing quietly on the road, his mouth still firmly restricting the circulation of air, and all at the cost of his nostrils twitching rapidly.

He knows that all these things are normal for him, and the moment the human body recovers from anaerobic exercise to aerobic exercise, the rapid movement of the lungs will automatically and constantly speed up the rapid circulation of blood all over the body, so that the cells can be repaired.

On this basis, the conversion of hemoglobin to oxygen and carbon dioxide will also be accelerated indefinitely, and similarly, under the traction of mutual interference, the blood regulation center, the pumping of the heart will also be accelerated, and the sound of jumping twice per second will be transmitted in the body like thunder.

Breathing in and out, after just indulging himself for a minute, Winter Night began the next step of his cultivation plan.

Breathing, yes, controlling the breathing, even in such a situation where he succumbed to his body's instincts and was completely uncontrolled by his mind, Winter Night did not intend to let go of his body.

He didn't have time to grow stronger! He didn't know when the so-called protection would wear off, and with that in mind, he began to force himself to slow down his breathing.

When there is a lack of oxygen in the body's cells, the decrease in the number of breaths means that the amount of oxygen and carbon dioxide that needs to be converted for one breath increases, and this is the ultimate goal of the winter night.

In his understanding, as long as he can control the rate of breathing, it means that in high-intensity battles, the recovery power that each breath can provide him is stronger, and it will allow him to fight for a longer time, that is, more physical strength and endurance.

As long as you can control your breathing, you can increase the amount of energy you can take in one breath, and at the same time, the fatigue due to the decrease in the number of breaths will give the respiratory system a long exercise, in other words, the internal organs will be strengthened at a deeper level.

In addition, the cells are constantly undergoing anaerobic and aerobic replacement, which means that the strength of the cells will increase in such a situation, from the muscles to the viscera to the cells, the body will undergo an increase in quality both internally and externally, so for the winter night, this will undoubtedly be the shortest and most effective way to strengthen itself.

But the ideal is very beautiful, but it is very difficult to achieve, and the failure again and again makes him almost lose patience, even if he can clearly perceive the internal situation of the body, but the body instinct is not so simple to be controlled.

Quiet, quiet! Be quiet! Winter Night's right fist clenched because of the beginning of the riot emotion, instantly smashed on the left chest, the sudden impact seemed to make the heart feel fear, and the jump seemed to be reduced a lot in an instant.

Does this work? I don't know what the truth is, but I think it's an experiment, and Winter Night is beating his fists again, again and again, and at the same time, he is almost addicted, because of the high concentration of his mind, accompanied by every rhythmic percussion, Winter Night feels that his breathing is inexplicably controlled.

"Boy, are you punishing yourself?"

The abrupt accosting, because of the fright, almost made the breathing that the winter night had managed to control get out of control again.

Without speaking, Winter Night turned his head expressionlessly and looked at the guy who stopped beside him, the green tights seemed to be somewhat familiar, as if he had seen it not long ago.

Looking carefully at the other party's face, the hairstyle of the watermelon head makes people have a kind of complaining thoughts, and there are not many beards parallel to the top and bottom of the mouth, but it makes people feel a strange sense of maturity, and the bright smile on the face may be the most disgusting place in the winter night.

Look at this guy in front of you, do you know him? The first thought was that, but the answer was that Winter Night was not clear, because after being deceived by memory, he already had a kind of resistance to think about the past, saying that he was now a son of a traitor, what was the reason for his conversation?

Whatever the reason, Winter Night ignored the other party, silent, Winter Night felt a little regained some strength, and he began to walk towards the path in small steps.

"Boy, are you still persevering? It's really youth! In that case, let's see you again later. ”

In the face of the ignorance of the winter night, the other party didn't seem to care, and after speaking, he accelerated away again, like a gust of wind, bringing a little coolness, and completely disappeared from the field of vision of the winter night, the only confusion left to him was, why say again?

Properly cover up such a problem, and immerse your mind in the inside of your body while walking slowly on a winter night.

In this way, every once in a while, a familiar voice would ring in his ears, and then, in the midst of the cry called "youth", the winter night was over for the morning practice, and in order to escape the trouble, he regained his strength and ran back to his home.

••••••

"I'm back." Winter Night clearly knew that this was the second day he really wanted to spend in this home, and he was still a stranger who broke into this place at the moment, so he tried to use this way to gradually forget this strangeness.

Because I was running home, my relaxed muscles felt a sore feeling, and I took off my sweat-soaked clothes, and planned to take a shower before breakfast on a winter night.

After about fifteen minutes of soaking in the warm bathtub, the winter night forced itself to break free from the comfort feeling.

Under the high-intensity exercise, people's appetite will also increase, and the winter night forces the already weak to make a fairly hearty breakfast.

When the belly is filled, and the warm miso soup is blended, a lazy mood wells up in my heart, and at that moment, the winter night really wants to lie quietly all day.

Such thoughts are only fleeting, and it is impossible to indulge yourself in a winter night that wants to get stronger all the time.

The cutlery was placed directly on the table, and he didn't bother to pay attention to it, and his standing body walked towards the practice room, and with the sun hanging high in the sky, the light dispelled a certain degree of cold.

The silent winter night silenced the mind, with the previous experience, the physical energy in the cells was easily extracted, under the control of the spiritual power, the physical energy and the spiritual power were easily fused together, a blue energy, called chakra energy by the ninja, began to produce and was poured into the meridians.

Although it was only the first day of exercise, Winter Night was keenly aware that with the improvement of physical fitness, the number of chakra extractions seemed to have increased a little.

Winter Night also has its own understanding of such a situation, and the formation of chakra is a fusion of two energies.

The first is the body's energy taken from the body's 130 trillion cells, one by one. The second is the spiritual strength that has been tempered by going through a lot of cultivation and accumulating experience.

The physical energy is pulled by the spiritual power, and then the two energies form the chakra in a certain proportion, and this process is the refining of the chakra.

Therefore, the reason why the limit of chakra is formed between the two energies that a ninja has is that it is limited by the side of the two types of energy, which is the so-called short-board effect.

Winter Night's spiritual energy may be due to soul fusion, it is still very powerful so far, and even after opening the Writing Wheel Eye, this spiritual energy has exploded again, and it is difficult to see the limit.

Therefore, theoretically, as long as the physical fitness of the winter night improves, the corresponding increase in physical energy, the total number of chakras will also increase.

The only restriction on the current chakra increase in Winter Night is probably his age, and the body bound by age cannot be made even if he exercises more, and the fully mature body is not fully developed.

Time slowly drained, because he made up his mind not to go to school for the time being, so all his thoughts on Winter Night were focused on the refining of chakra, and after an unknown amount of practice, he felt that the total amount of chakra in his body had stopped growing, and this was also the first time he felt the restraint from his body since he came into contact with the chakra refining method.

Feeling the saturated amount of chakra, Winter Night did not intend to continue such a meaningless act until it was consumed.