The 400-meter dash is the hardest of all sprints. It has high requirements for athletes' physiology, special skills, physical fitness, physical strength distribution, etc.

First of all, in terms of physiology, due to the long distance of the 400-meter sprint, anaerobic accounts for a large proportion and aerobic accounts for a small proportion during the whole exercise, so this is a mixed oxygen sprint event. In the process of exercise, especially in the second half of 400 meters, the oxygen consumption in the body is caused by the high-speed exercise in front, and the body will be in a state of hypoxia, at this time, the oxygen absorption is lower than the demand for adenosine triphosphate, so it is necessary to decompose the glycogen in the body into lactic acid to provide new energy. This process is actually a test for athletes, so it is common to see athletes in the 400 meters on the training ground holding their stomachs as if they are going to vomit, which is actually a normal reaction of the body in an anaerobic state.

In terms of special technology, 400 meters and 200 meters are technically universal, but 400 meters have one more curve and a straight, which is destined to be different in technical details. At the same time, due to the relatively long distance, the adjustment of physical strength distribution and rhythm has become the key, athletes can not rush too fiercely as soon as they come up, and it is impossible to completely do not exert force, the best situation is to run 400 meters when just squeezing their physical strength clean, so athletes should be adjusted according to the actual physical condition of the game, which also puts forward new requirements for athletes.

And in the system, Zhang Guan found a skill. The name of this skill is "Incomplete Sprint Activation". The description of the skill at the normal level is "In the state of sprinting or cornering sprint, activating this skill will obtain 75% of the original effect of sprinting or cornering sprint, and the physical consumption will be reduced to 60%, and the effect will disappear when the skill is turned off"; The effect of the expert level has been increased by 5%, and the cost has been reduced by 5%; At the Expert level, the Master level has a 5% increase in effect and a 5% reduction in cost, reaching the level of "Gain 85% of the original effect of a sprint or corner sprint." Stamina cost reduced to 50%".

There is no limit to the duration of this skill, and the effect can be eliminated by canceling the skill directly, but there is a premise for using it, that is, the interval between two uses should be greater than 30 seconds.

For the 400-meter sprint, this is definitely a miracle skill, and the 400-meter dash is the biggest difficulty in controlling the speed rhythm and conserving physical strength, and this "incomplete sprint activation" skill is exactly able to do this. So Zhang Guan did not hesitate to spend three skill points and upgraded this skill to the master level.

Zhang Guan did not tell Yu Gui that he wanted to practice 400 meters, he knew that if he told Yu Gui, Yu Gui's temper. will definitely scold himself, saying that he didn't even learn to walk and learn to run. But Zhang Guan has other ways to do it.

At dinner, Zhang Guan sat in front of two athletes specializing in the 400-meter event, pretending to chat at first, and then the topic was pulled to the 400-meter event by Zhang Guan. When it comes to their own specialty, these two athletes immediately show that they know everything and say everything.

"The start of the 400m dash is not as important as the 100m or the 200m, the 100m start is a race against time, while the 400m start is more about making the next acceleration smoother. The first 100 meters of the 400-meter run are corners, and this stage starts with acceleration. Generally, only seven or eight percent of the force is used, and the speed is quickly increased and immediately turned to a constant speed of the corner, and the whole curve should maintain a certain rhythm. The second 100 meters is the straight, said to be the straight. In fact, there is only 80 meters in a straight line, and this stage is mainly a high-speed run at a constant speed, and the key point is to control the rhythm and not do your best. But don't be too slow, try to keep yourself in a more comfortable pace. The third 100 meters is the hardest of the 400 meters, mainly because the body's performance has begun to decline. And at this stage, you also need to adjust the rhythm of the exercise, and adjust the physical condition to the best state as much as possible to cope with the next 100 meters of sprint. As for the last 100 meters, there is nothing to say, run with all your might, run as fast as you can! A 400-meter athlete spoke.

"Sounds so complicated!" Zhang Guan was very teachable and said: "How to control the breathing, running 100 meters is to rush to the finish line in one breath, how to ventilate 400 meters?" ”

Another person said: "Two steps, one exhale, two steps and one inhale, or three steps, one exhale, three steps and one inhale, the methods used by different athletes are different, and everyone's physique is different, so it is difficult to say which method is better, you can only choose the method that is more suitable for you." However, whether you choose to breathe in two or three steps, you should increase the depth of your breathing as much as possible to increase the oxygen content in your body. ”

"Is there anything else I need to pay attention to?" Zhang Guan then asked.

"That's a lot. For example, the warm-up before running is very important, if the 400-meter warm-up is not done well, it is easy to get injured, I am not talking about external injuries on the limbs, but internal injuries to internal organs, which will be more troublesome to recover; In addition, the pace should be as large as possible in the first half of the run, which can reduce the frequency of some steps, reduce physical exertion, and ensure that there is more speed reserve; In addition, when entering the straight from the first corner and from the straight to the second corner, the rhythm and pace need to be adjusted quickly, otherwise the speed will be greatly affected; In the second corner......"

While the other party said, Zhang Guan nodded and silently remembered it in his heart, but this way of talking on paper made Zhang Guan's heart itch, and he couldn't wait to experience it for himself on the sports field.

……

The night was getting deeper, the temperature was suitable, but there was a faint dampness in the air, and the dense branches and foliage hanging from the trees on the roadside somewhat blocked the street lamps, and the dim light shone on the ground through the gaps in the leaves, forming strange shapes, and from time to time the breeze came slowly, and these shapes began to change like little monsters.

Yu Gui walked on the sidewalk with a drunken face. His family is in the capital, so every day after work is a special torment for him, and he thinks of his family. So occasionally he would call a few colleagues to a nearby tavern, order a few side dishes, and drink a bottle of wine to relieve the loneliness in his heart. However, those colleagues all live in the city, so after the party is over, everyone will go home, and Yu Gui can only return to the dormitory of the training base alone.

Seeing that he was about to walk to the door of the training base, Director Yu felt a little irritable. He was the only one in the dormitory, and when he went back, he could only face the TV, which made him feel very bored.

Suddenly, he saw that there seemed to be a glimmer of light on the training ground that had not been extinguished. He subconsciously walked over, and sure enough, he saw that someone was still training.

"It's so late, and there are still people training, who is it!" Yu Dao slowly approached, but found a familiar figure, it was Zhang Guan! But Zhang Guan didn't find Yu Gui in the dark.

"It's Zhang Guan!" Director Yu was first taken aback, and then a relieved smile appeared on his face. When he saw that Zhang Guan was still practicing in the middle of the night, the original depressed loneliness in his heart disappeared in an instant, and at this moment he felt that the sacrifices he had made before were worth it.

"Yes, that's great! This kid has finally grown up! I knew that my skills still needed to be improved, so I came to practice in the middle of the night. It's good to be willing to work hard, although this child's learning ability in special technology is indeed poor, but the physical talent is very amazing, and now I know that hard work, the future is limitless! Director Yu admired. At the same time, he continued to hide in the dark and observe Zhang Guan's training.

Then, he saw Zhang Guan run from the corner into the straight, and then didn't stop at the end of the straight. Instead, he ran into the next corner.

"How did you overrun!" Yu Gui almost shouted, the end of the 200 meters was at the end of the straight, so Yu Gui thought that Zhang Guan should stop after rushing through the straight, but he didn't expect Zhang Guan to continue to run forward.

"What is he doing?" Director Yu felt a little inexplicable. Then he saw Zhang Guan run through the corner again, enter the straight again, and then start the sprint at great speed.

"How do you feel like you're running 400 meters? Wrong. That's running 400 meters! Even if he was shrouded in drunkenness, Yu Gui was still the best sprint coach in China, and in an instant he made an accurate judgment that Zhang Guan was running 400 meters.

"Is this a food and a run! If you haven't finished the 200 meters, let's run the 400 meters! I want to learn to run if I don't know how to walk! 400 meters is the most difficult sprint, do you still think that it is like running 100 meters, rushing forward without a brain! Director Yu felt a little angry, and he was ready to step forward and teach Zhang Guan a good lesson.

But then he stopped again, and he saw that Zhang Guan seemed to be thinking, and then began to warm up again. Yu Gui didn't come forward, he decided to observe first.

After Zhang Guan rested for more than ten minutes, he stood on the starting line again, and it was the starting line of the 400-meter sprint, and this time Yu Gui finally confirmed that Zhang Guan was really running 400 meters.

Director Yu was ready to step forward again, and at this time Zhang Guan had already started.

"Huh? At this speed, it seems that the sense of rhythm is quite good! Director Yu stopped again and continued to observe, he saw Zhang Guan enter the straight from the curve, and then the straight into the curve.

"Bad, terrible! That's not how you run in corners into straights, ouch, straights into corners run even worse! Director Yu complained a few words, but then found that Zhang Guan's sense of rhythm was very good, especially the distribution of speed in the first half of the race looked very good.

"The distribution of speed is very good, the degree of power in the first half is just right, no, it should be said to be perfect! A lot of veteran athletes can't do it at his level, how did he do it? Yu Gui knew that a good distribution of speed meant that he could save more physical strength for the final sprint, and he couldn't help but start looking forward to Zhang Guan's final sprint, because the straight sprint was Zhang Guan's strongest point.

Sure enough, Zhang Guan had already begun to accelerate at full speed before he entered the final straight line, and when he rushed into the last straight line, his speed had increased to an extremely high level.

At this time, Zhang Guan had already turned off the "Incomplete Sprint Activation" skill, so he showed much faster actual speed than other athletes at this stage.

"What a situation! Did he run 400 meters or 200 meters? Why is it so fast in the end! Yu Dao blinked, convinced that he was not mistaken, and then almost sat on the ground in fright.

"It can't be! No one can sprint with such stamina after 300 meters! Zhang Guan's current speed is about the same as the sprint speed of some provincial 200m athletes, why is this happening? How did he do it? Is he still human? Being able to make this kind of speed means that he still has a lot of physical strength, how is this possible? Could it be that the previous consumption is relatively small? But he wasn't too slow ahead! Is it because of the good distribution of speed, so there is more physical strength to make the final sprint? Yu instructed him to find that Zhang Guan had done another thing that he couldn't think about.

"In the 400-meter sprint, the distribution of speed and stamina is the hardest, and Zhang Guan looks almost perfect at this point; As for the other technologies, they still suck! Especially the adjustment between the corners and the until, which is the most basic technique, he can't! Yu Gui suddenly felt a little depressed, the special skills that others are easy to learn, but Zhang Guan is very slow to master; The distribution of speed and physical strength that others struggle to master is a breeze for Zhang Guan.

"Is it talent again?" Yu Gui muttered to himself.

At this time, Zhang Guan seemed to be preparing to start again.

Yu Guimeng remembered the terrible technique when Zhang Guan turned the straight, and finally couldn't help it, he walked out of the darkness, and shouted at the same time: "Stop, stop, it's not like this when you enter the straight!" (To be continued.) )

PS: The fourth update is delivered, say in advance that tomorrow will continue the seven chapters, ask for a monthly pass! Ask for a referral ticket! Thank you book friends Crow's Eyes, Dulu Fox, and I love fantasy. Fantasy, Izumi 18, obizy, book friend tail number 3524, coffee house and piano, rat on the fence, sdgi, dark spirit drifting, nickname xxoo, sdassdfa, wind の fragrance, QWEEEDSA, looking for the legendary net wolf, gchbin tip. Thank you!