In fact, Kester doesn't have to worry too much about Zhou Yi, because for the Dortmund youth team, Zhou Yi is not a completely unfamiliar newcomer.

After all, Zhou Yi had played against them, and had two assists and one goal in that game, which left a very deep impression on Dortmund's youth team.

This is true whether it is the advantages or disadvantages of Zhou Yi.

This can be seen from the training content arranged by the youth team head coach Ecker for Zhou Yi.

In addition to the whole game of training with the team every day, Zhou Yi also has to perform more physical training than other players, especially physical training.

What Zhou Yi lacks the most now is physical fitness, and his physical fitness is completely unable to meet the requirements of a professional player.

Of course, Zhou Yi is not a professional player now, but becoming a professional player is the goal of hard work.

The youth team does not have a full-time physical coach, so Zhou Yi's physical training is led by the first-team physical coach Mr. Oliver Bartlett.

From this we can also see that Klopp's emphasis on Zhou Yi is not just about saying it.

You know, Oliver Bartlett is a physical training expert that Dortmund Club attaches great importance to. He is willing to give a small meal for a youth team player, which is not simple in itself.

In the first physical training class at Zhouyi Institute, Bartlett did not immediately arrange a physical training plan for Zhouyi, but instead asked Zhouyi a question with his arms around him: "How do you understand physical fitness, young man?"

After listening to Keest's translation, Zhou Yi didn't understand why the coach asked this question, but he still honestly answered: "It's endurance."

"Wrong." After hearing the answer, Bartlett shook his head.

"Wrong?" Zhou Yi was surprised. He has always understood physical fitness in this way. Physical fitness is equal to endurance. Players with good physical fitness have good endurance and can run longer and farther on the court. Is there anything wrong with this?

And it’s not only what he understands, but also how FM and live football are in football games.

How could this be wrong?

Seeing Zhou Yi's surprised look, Bartlett asked him back: "I heard from Tim that you have been going on a morning jog every morning?"

Zhou Yi nodded proudly. With his personality, it is indeed something to be proud of for so long.

But Bartlett doesn't think so.

He directly denied Zhou Yi's practice of jogging to increase physical fitness: "Although jogging at a balanced pace in the field and in the park can improve jogging ability, such training cannot improve your physical fitness in the game. Physical fitness is not just the simple concept of 'endurance'. Remember, football is a sport that includes many sprints and high-intensity anaerobic movements, with some low-intensity aerobic recovery periods in between to prepare for the next high-intensity operation round."

After listening to Kester's translation, Zhou Yi opened his mouth wide.

Seeing Zhou Yi's expression, Kester asked, "What's wrong?"

"Uh... the coach said it very well, but... can he tell me again?"

Kester knew that Zhou Yi didn't understand, so he said to Bartlett: "Can you explain it in detail? Don't have so many professional terms..."

"Simply put, you will make sprints, shots, jumps, tackles or intercepts during the game. These are high-intensity anaerobic actions. Your body needs to consume adenosine mitsubishi acid, referred to as ATP, and use some glucose to supply muscles to perform these high-intensity actions." Bartlett explained.

Although there are still many professional terms, Zhou Yi understood this time, which means that if the body wants to do movements, what kind of ATP and glucose need to be consumed.

"Then the players will recover during the low-intensity stages of the game, such as walking, jogging, and standing, so that ATP will be replenished, and lactic acid will be eliminated. Lactate is the reason why your body feels sore after a lot of exercise. Lactate is metabolized by aerobicity, which is one of the reasons why people's breathing worsens after slowing down or stopping vigorous exercise."

Bartlett continued to explain, and he explained based on actual examples. Even though he was still full of professional terms, Zhou Yi could understand it.

Simply put, you need to rest after strenuous exercise so that your body can recover and gain the energy to continue strenuous exercise.

"The time interval for a player to restart high-intensity exercise depends on the speed of his ATP replenishment, the amount of lactic acid metabolized, and the degree of completion of some other electrolytic processes related to muscle contraction. Recovery is an aerobic process. The higher the aerobic ability, the faster he recovers and the higher the frequency of running at full speed. Therefore, the longer the time to play at the best condition without feeling tired."

"So, what we mean in football is not just the ability to run for a long time, but the ability to recover quickly. Football is not a marathon. You don't need to run for ninety minutes non-stop, but there will be a lot of anaerobic exercises. If your body cannot recover from anaerobic exercises quickly, then you will naturally not be able to persist in the game for too long, and you will easily feel fatigue."

"After you understand what physical fitness is in football, you will understand why I said that jogging in the park will not improve your physical fitness during the game. Because improving your ability to jog will not allow you to quickly recover your energy during the game."

Zhou Yi was already stupid, but this time he was not because he didn't understand, but was shocked by the professional football club's professionalism.

Yes, after listening to Bartlett's words, he was full of two words: Professional!

This is a professional!

In the past, I thought I could run 10,000 meters with a sandbag tied to a sandbag, but now I realize that it is nonsense.

And it’s not just him, judging from the slogan “10,000 meters every day” of Haitang spring training, Chinese football is not very professional…

No wonder the level of Chinese football is not up.

If Chinese football practitioners are so unprofessional, they are thinking about rushing out of Asia and going to the world... that is indeed a dream.

The Chinese team once participated in the World Cup finals in history, but that time was just a good luck, which did not mean that the strength of Chinese football improved. Everyone has seen what happened later, which fully shows that Chinese football has not yet found the right direction.

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Then Zhou Yi further realized the professionalism of European giant clubs.

After explaining to Zhou Yi what the concept of "physical energy" in football, Bartlett did not immediately start training Zhou Yi, but conducted a test on Zhou Yi. According to him, this was to detect the distribution ratio of fiber types in Zhou Yi's muscles.

According to previous explanations about physical fitness, it can be seen that football players will continuously cycle during anaerobic and aerobic exercises during the game. The corresponding two types of muscle fibers in the human body are two types of muscle fibers.

Large fast muscle fibers can generate a large amount of tension very quickly, but cannot continue to generate such a number of tensions during multiple contractions. Smaller slow muscle fibers generate less tension at a slower speed, but can continue to contract repeatedly.

Therefore, fast muscle fibers can generate a large amount of anaerobic energy for the rapid generation of tension. When players sprint, jump, tackle, and shoot, explosive force is required, and the anaerobic energy is all used in the body. Slow muscle fibers can generate a large amount of aerobic energy for repeated contractions.

The distribution of fast muscle fibers and slow muscle fibers is largely determined by genetics, which is called "talent".

Some people are born to run fast, which means that the proportion of fast muscle fibers in the body is more.

It is impossible to change the muscle fiber distribution ratio through acquired conditions, so we must first figure out which kind of muscle fiber Zhou Yi has, so that we can make targeted training arrangements.

It’s not what everyone thinks. Zhou Yi’s physical fitness is not good, so just focus on training content to enhance physical fitness.

How to test Zhou Yi’s muscle fiber distribution specifically?

In fact, it is also very simple. Just test the endurance of muscles. First, use the instrument to test the maximum strength of Zhou Yi's muscle contraction. For example, if you want to test the proportion of muscle fibers in some muscles in your legs, let Zhou Yi sit on the adjustable leg-punching exerciser, then let him stomp the baffle in front, and then gradually increase the weight. Observe Zhou Yi's situation. If Zhou Yi really can't stomp, then the weight he can stomp for the last time is the maximum strength of his muscle contraction.

Then take 80% of the maximum strength as the test strength standard. Let Zhou Yi repeat the training on this strength to see how many times he can persist.

If it is more than fifteen times, it means that the slow muscle fibers account for a high proportion in this part of the muscles. If it is less than five times, it means that the fast muscle fibers account for a high proportion.

Just test part of the muscles.

Finally Bartlett came to the conclusion.

The ratio of Zhouyi fast muscle fibers to slow muscle fibers is 54:46.

He has fewer slow muscle fibers, so he has poor physical fitness.

This result disappointed Zhou Yi: "Isn't that saying that I am born with poor physical fitness, and I have no chance to improve my physical fitness?"

Bartlett shook his head: "If this is the case, what else should we physical coaches do? Our physical coaches are specifically responsible for cultivating and enhancing your physical fitness. You should know that young man. Speed ​​is natural, but physical fitness can be improved through acquired training."

He patted Zhou Yi on the shoulder: "So don't worry, you will definitely not be able to play half-game forever."

Zhou Yi quickly defended: "It's seventy minutes."

But Bartlett doesn't care about the difference.

"It's almost the same." He shrugged and curled his lips. "Okay, that's the end of today."

Zhou Yi was surprised: "No training anymore?"

"When I go back and develop a targeted training plan for you before starting training," Bartlett said. "We will start formal training tomorrow. Today you should take a good rest first. Don't be too tired. You have to start training when you fly over from China. There is no benefit in addition to showing your own attitude. Remember, rest is the first step in physical training. If you don't have a good rest, don't think about training well."

Bartlett picked up the notebook containing all the muscle data of Zhou Yi and left. Zhou Yi was still stunned, savoring his last sentence.

Rest is the first step in physical training...

This is the first time he has heard of it.

But...it seems to make sense!

It's professional!

"Mr. Bartlett is this attitude. He speaks very straightforwardly. He doesn't like nonsense. So don't take it to heart, Zhou Yi." But Kester thought Zhou Yi was stunned because he was stimulated by Bartlett's words, so he quickly comforted him.

Zhou Yi shook his head: "How could that be, Mr. Kester. I'm not happy to have such a coach who directly points out my problem and saves all of us time. Don't worry, Mr. Kester. I'm not a glass heart!"

"That's good." Keest laughed. "Okay, let's leave too. Have you forgotten that you are moving today?"

Zhou Yi was stunned for a moment before remembering that there was something going on!

The club has approved his application to stay at Wagner's home, and today we will move from the hotel to his teammate Mark Wagner's home!

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Chapter completed!