The Su God of the Reopening of the Sports Arena

Chapter 2522 On how a 9.49-second time in a major competition was achieved.

Rapid return.

"Then why is Su able to do it?"

"Watch his game."

Green said, "Look at Moscow, the last forty meters are 0.84, 0.88, 0.87, 0.88."

"Let's look at the last forty meters of the Bird's Nest this time! 0.84 0.83 0.86 0.89!"

"Has anyone noticed anything wrong?"

"You may not see any problems at all, but let me tell you there's a lot of secret here."

"To understand this problem, we must first look at the 60 meters ahead."

"The 60-meter split in Moscow is 0.83, which is also the highest speed surpassed. There is a slight difference in the thousandths place, but the difference in the hundredths place is not significant."

"Therefore, the real difference lies in the 80-meter range. Because at the 70-meter mark, both are 0.84, and both show a downward trend."

"It wasn't until we reached an even higher level, that is, when we went deeper to 80 meters, that the temperature in Moscow suddenly dropped to only 0.88, but in the Bird's Nest this time, it actually rose to 0.83!"

"Let's directly compare the technological gap between Moscow and Beijing's Bird's Nest."

Green added a layer of armor to his jacket, afraid of offending the big boss: "It's not that his Moscow technique is bad, it's just that compared to BJ, there's clearly still a gap. This is enough to show that an athlete at his level can still improve like this, and he's destined to succeed."

“All athletes should learn from his spirit.”

Wow, who said Europeans and Americans don't know how to toast?

They clearly know everything.

As long as you give him the ability to offer a toast.

In capitalist countries, no one would turn down money.

They'll be kneeling down faster than anyone else when the time comes.

Moreover, there was no psychological pressure involved in kneeling.

"In the Moscow section, 50-60 meters, the time for each segment is 0.83 seconds. It seems extremely fast, but compared to the Bird's Nest, the potential for poor power transmission is highlighted."

"As the 'speed foundation segment' in the mid-to-late stages, the core problem with this 0.83-second peak speed is 'low power efficiency and insufficient inertia reserve,' not a truly efficient peak speed. I believe the specific shortcomings are..."

Green clicked the mouse. He couldn't actually do this kind of thing himself. Although he was an old tech emperor and a tech master of the older generation, professional things should still be left to professionals. He couldn't let the team he had invested in go to waste.

He was just saying that athletes can apply techniques better, which doesn't necessarily mean they have stronger theoretical research skills. This distinction is important.

In terms of on-the-spot application, Green definitely outperforms 99% of people worldwide. However, if we only compare theoretical research and detailed analysis, while Green is very strong among athletes, he still lags behind professional teams and experts.

Otherwise, there wouldn't be the saying that "a trade is like a mountain to climb."

Especially in the current field of competitive sports, even the smallest details can make a huge difference.

Therefore, there is an increasing demand for unity and cooperation at this stage, as well as cross-disciplinary research between different fields.

It cannot be achieved by relying solely on one person's individual efforts.

You can tell by looking at Mills's situation.

It will soon reach its peak, and then it will be unable to go any further.

"First of all, you can see that there is a hidden imbalance in the direction of force. Especially compared with the Bird's Nest side, the angle of force exerted by the right foot when starting is more vertical, with the vertical component accounting for as much as 45% and the horizontal component only 55%. Although it can maintain a speed of 0.83 seconds with the inertia of the initial acceleration, a large amount of energy is consumed in the vertical lifting of the body, rather than the accumulation of inertia of horizontal displacement."

"The torso posture has shown signs of standing upright prematurely. At the end of the 50-60 meter mark, the angle between the torso and the ground is close to 60°. The more reasonable acceleration posture is too upright, and the transmission channel of horizontal thrust begins to contract. It is not a continuous acceleration posture throughout the entire process."

"Neuromuscular mobilization has been slightly delayed. Starting with the right foot goes against the body's instinct to 'start with the right foot first.' Look here: after 50 meters, the mobilization speed of the nerves on the lower limb muscles begins to slow down, and the muscle activation sequence is slightly disordered, which foreshadows the connection block at 60-70 meters."

"This directly affects the next 10 meters, 60-70 meters, with a split time of 0.84 seconds and a slight increase in speed of 0.01 seconds, but in fact the transition fault is fully revealed."

"You might ask, 'Wait a minute, the Bird's Nest only had a time of 0.84 this time, right?' No, the same speed can make a big difference when viewed as a whole. If you look at it individually, of course it's the same speed, but sprinting is a holistic sport. Even if you look at the entire second half, it can be as much as 40 meters."

"When viewed in a holistic context, this is a very big problem."

“这段0.84秒看似仅比50-60米慢0.01秒，实则是加速能力彻底丧失的起点，也是50-60米隐患的集中爆发。”

"First, the horizontal thrust is completely interrupted: at 60 meters, the torso is completely upright, with an angle of 65° to the ground, which completely ends the force exertion posture of horizontal acceleration. The vertical fluctuation of the center of gravity rises to 3cm, and the energy loss is doubled compared to 50-60 meters. This can lead to the conclusion that the speed of 0.84 seconds is a "passive inertial continuation" rather than an active acceleration."

"One is passive, the other is active; they are very different."

"Secondly, the neuromuscular coordination disorder began to worsen. The muscle activation sequence changed from 'hip → quadriceps → gastrocnemius' in the 50-60 meter race to chaotic activation. The peak force of the push-off was only 2800N, which was 400N lower than the same period in the BJ race, and could not support the continuous high-speed inertia of 50-60 meters."

"And the change in the peak force of this push-off is actually a continuation of the technique implemented in the previous 10-meter race, so the whole competition must be viewed in a connected way."

"Furthermore, I believe that compared to the 60 and 70 meters at the Bird's Nest, there was a rigid blockage in the transition in Moscow. Look at this step; you can see it in slow motion. The third step after the right foot starts, the core support step in the 60-70 meter phase, is supported by the left foot. At this point, the pelvic rotation angle exceeds 8°. As a result, the core muscles cannot exert stable force, causing the power transition from 60-70 meters to 70-80 meters to become disconnected. This is the direct cause of the speed dropping from 0.84 seconds to 0.88 seconds in the next phase."

"The 70-80 meter split time is 0.88 seconds. This is the most important point and the biggest difference between the two races. Pay attention, the biggest difference is here! Starting from this split in Moscow, the speed drops by 0.04 seconds. The core issue is that the ability to maintain top speed in the later stages fails."

What does "failure to maintain rapid progress in the later stages" mean?

"As you can see from the pictures, the horizontal propulsion drops precipitously, the flaws in the right foot starting power pattern are fully exposed, the proportion of horizontal force during the push-off continues to decrease, and it is unable to counteract the air resistance and ground friction in the later stages. The initial speed inertia is completely exhausted, causing the speed to drop sharply from 0.84 seconds."

"Neuromuscular coordination is completely out of control, the muscle activation sequence is further disordered, the core and lower limbs are disconnected, the force of pushing off the ground cannot be effectively transmitted as forward propulsion, a large amount of energy is wasted in ineffective movements, and the strength of the force in the first half of the movement cannot be maintained."

"The acceleration phase ends too early, and the torso stands upright too early, causing the acceleration cycle to end prematurely. The range of maximum speed is not long enough, and the vehicle enters a passive deceleration state after 70 meters. As a result, it is very difficult, or almost impossible, to actively exert force to maintain speed."

"Then it directly enters the 80-meter node, the critical point of speed collapse, completely leaving the maximum speed range, and completely losing the possibility of acceleration."

"And once the speed maintenance collapses, it will trigger a chain reaction."

"For example, if the ability to maintain speed is completely lost, the speed at 80 meters will drop significantly compared to 50-60 meters and 60-70 meters, completely leaving the high-efficiency and high-speed range, becoming the starting point for continuous deceleration in the later stages."

"For example, if the force generation mode shifts to passive compensation because the ability to maintain speed is lost, then the push-off action will change from active propulsion to passive push-off, directly causing the power chain of the hip, knee and ankle to break, the storage and release of elastic potential energy to become disordered, and it will no longer be able to generate effective propulsion."

"The combination of these two negative consequences will lead to the most serious outcome: a double collapse of physical strength and technique! Everyone should know that in the 100-meter race, if the energy loss caused by technical defects in the early stages is compounded by the premature accumulation of lactic acid, and the efficiency of muscle contraction drops significantly, then in the subsequent 80-90 meters and 90-100 meters, you will only be able to barely maintain your speed, with no room for overtaking or speeding up."

"It's absolutely impossible to have any more."

"Of course, there are also surprises in Moscow. From the current perspective, the seeds have already been sown for this year's Bird's Nest stadium, which is that the speed will rebound slightly at 80 to 90 meters!"

"Isn't synthesis a return to speed?"

"It's just that this kind of return is insignificant compared to the rapid return this year."

Green tapped a few times, and the next section of the analysis report was displayed.

80-90 meters, segment time 0.87 seconds.

"Of course, I think this slight rebound in speed is essentially a passive adjustment rather than an active acceleration."

"This is absolutely not a criticism of Su; it is precisely a concrete manifestation of his ability to make subtle bodily adjustments even in extreme environments."

"Then why do I say that the slight speed rebound of 0.87 seconds in that section was not the result of Su actively accelerating, but rather a temporary compensatory adjustment made by the body after the speed plummeted and the power exertion became completely disordered in the 70-80 meter section? The reason is that... this adjustment was not systematic at all, but merely an instinctive reaction of the body to balance the imbalance of power exertion in the early stage, and could not reverse the core trend of passive deceleration in the later stage."

"The horizontal thrust remains at an extremely low level throughout the entire journey and has not been substantially improved due to slight fluctuations in speed. The difference in thrust intensity is significant compared to 50-60 meters and 60-70 meters, and it is only slightly relieved compared to the power collapse state at 70-80 meters. At this point, it is actually impossible to form a continuous and stable forward thrust, let alone the foundation for returning to the maximum speed range."

"Furthermore, maintaining speed throughout the race relies entirely on the slight residual momentum at the 80-meter mark. Add to that the temporary adjustments to torso posture and ankle exertion, and there's no proactive acceleration logic to support it. The power chain remains broken, and the problems of insufficient core stability and neuromuscular coordination disorder haven't been resolved..."

"By combining these issues, we can draw the final conclusion that although Su's speed rebounded here, this slight rebound was only a brief fluctuation during the deceleration process in the later stage, rather than a turning point of acceleration."

"This point must be established, otherwise the rebound speed will be much faster than this."

"Then came the final ten meters in Moscow."

"90-100 meters, segment time 0.88 seconds, just as I said, because it is passive rather than active control, when the compensatory effect is exhausted, the passive deceleration at the end of the Su will completely end and fail."

"The temporary attitude adjustment compensation effect at 80-90 meters was completely exhausted. At this point, it was naturally impossible to maintain a brief period of speed stability, and the speed naturally dropped slightly again to 0.88 seconds. The eye line energy was exhausted, and the trend of continuous deceleration in the later stage was completely irreversible. The speed difference compared with 60-70 meters and 70-80 meters further widened, and the collapse of the speed curve throughout the race was completely set."

"Moreover, when you get to the last ten meters, apart from those sprinters who are good at turning in the 200m and 400m, they may still feel like they have energy left. But for normal 100m sprinters, especially those who are early runners like me, neuromuscular fatigue will reach its peak at this point."

"So looking at the whole picture, we can conclude that the defects in the power transmission of the right foot at the start, the large amount of energy loss caused by the disorder in the exertion of force in the 60-80 meters, and the rapid accumulation of lactic acid in the later stages all lead to the inability of Su's lower limb muscles to generate effective push-off force."

"Muscle contraction efficiency drops to its lowest level throughout the entire process."

"The intensity of the exertion is far from meeting the basic requirements for the final sprint."

"In the end, he only managed a time of 3.47 seconds in Moscow."

"Of course, I must reiterate that this result is already incredibly impressive for a top-performing athlete, especially considering how fast he sprinted at the beginning. Only he could achieve this. If I had run that fast at the beginning, I probably wouldn't have been able to even reach 3.55 seconds at the end, and my entire rhythm would have collapsed."

"To be able to maintain such a speed after running at the maximum human speed, especially with a slight headwind, is truly remarkable."

"Sigh, someone said that's because their technology and equipment are advanced, and the rain in Moscow has almost no effect on them. Didn't our American team's running shoes, equipment, and logistical support used to be far ahead of the rest of the world?"

"Why didn't anyone accuse us of cheating back then?"

"It can't be that you're allowed to maintain your technological lead forever, while others can't catch up."

Green wouldn't make a mistake in a situation like this.

As long as one keeps quiet about politics, in the commentary world, one only needs to follow the boss's lead in terms of viewership.

You don't need to give me any more nonsense.

I can't hear anything.

"Okay, now for the main event, let's turn our attention to Su's performance at the 2015 Beijing World Championships in the Bird's Nest."

"It still starts at 50 to 60 meters. Why not start directly from 60 meters? It's because if you start directly from there, you simply won't understand how terrifying what he's doing is."

Greene pointed to the footage of the 100-meter dash at the World Championships that just ended this year, and a close-up 3D image of Suarez began to appear.

Their team is indeed getting better and better, and more and more technically skilled.

This would certainly live up to his reputation as the top commentator in the track and field world.

"Both segments achieved the same time of 0.83 seconds, but the underlying efficiency of power exertion, momentum reserve, and transition were fundamentally different. The 0.83 seconds in Moscow was a 'passive maintenance at the end of the race,' harboring the fatal hidden danger of a subsequent sharp drop in speed. The 0.83 seconds at the BJ World Championships, on the other hand, was a 'proactive advancement of efficient endurance,' the core foundation for a smooth transition from 60-70 meters and a return to top speed from 70-80 meters."

"While they appear to move at the same speed, they actually represent two completely different power generation logics and technical levels."

At this point, dissenting voices appeared on the public chat, with some even suggesting that Green was flattering her.

Hmph, Green merely curled his lips in disdain upon seeing this.

Forcing someone to praise you will naturally make you feel unsure and uncertain.

When someone steps forward to challenge you, you feel somewhat at a loss.

But it's not about praising someone sincerely, but about praising them based on facts.

Good guy.

That would make it completely different in terms of how exciting it is.

First of all, you are not afraid at all, and even secretly looking forward to it.

Has anyone stepped forward to speak out?

After all, if people like this don't step forward, the drama won't be as good.

It doesn't do justice to his professional expertise and image as a theoretical genius.

These days on the internet, Green, as one of the first to benefit from the live streaming trend, has gradually begun to feel that on this internet, it doesn't matter who you are or what others want to see about your true self.

At this point, what people want to see more is the persona you've created.

As long as you can maintain this persona.

Then everyone will think it's you.

On the contrary, you should show your true self.

That's what makes people feel uncomfortable.

There's no way around it; we're about to enter an era where traffic is king. If you still can't see this clearly at this point, you'll have to give back what you've gained sooner or later.

At the BJ World Championships, his time for the 50-60 meters was 0.83 seconds, but this time he... exerted his full power efficiently.

Lay a solid foundation for maximum range in the mid-to-late stages. "I say this based on evidence."

Looking at the comments, Green said slowly, "If the Moscow segment was a passive, inertial fallback, then the transition to the main force was completely disordered."

"The Bird's Nest is proactively leveraging its continuous capabilities this time, creating a seamless closed loop in its operational logic."

"What's the difference between them, both being 0.84? What are the variations?"

"I've already talked about the Moscow segment above. Now let's focus specifically on the Bird's Nest segment. The biggest difference in this 0.84-second section is that... here, Su's acceleration is a phased continuation of active acceleration, rather than a dissipation of inertia. It's the continuous release of the horizontal power advantage brought by the left foot start. Every push-off is an active force to propel the runner forward, rather than a passive push-off. The power intensity is always maintained at a high level, perfectly connecting with the 0.83-second extreme speed of the 50-60 meter segment."

"Let's look at the next step. The neuromuscular coordination and power transmission are optimized throughout the process. The muscle activation sequence is synchronized without delay. The core muscle group firmly locks the pelvic posture, thus eliminating any energy leakage. The force of pushing off the ground can be 100% focused on horizontal displacement. The connection between the force exertion from 50-60 meters to 60-70 meters is seamless, forming a virtuous cycle of 'speed leading speed'."

"The torso posture remained locked at the optimal acceleration angle, without any deviation from premature uprighting. The transmission channel for horizontal thrust remained unobstructed. The core value of this 0.84-second period was 'accumulating power for continued progress,' rather than 'barely maintaining it.' Each step built inertia, laying a solid foundation for the return to the 0.83-second peak speed of the 70-80 meter breakthrough."

"It is here that the predicament of 'exerting force in the first half and slacking off in the second half' has been broken. The 0.84-second mark has been upgraded from the 'inertial consumption phase' to the 'active power accumulation phase,' with no decline in force intensity and no decrease in propulsion, truly achieving 'uninterrupted acceleration.'"

“算是解决了莫斯科60-70米的发力卡顿问题，实现50-60→60-70→70-80的无缝衔接，让速度惯性形成正向积累，而非中途损耗，为后程极速回归扫清了衔接障碍。”

"By precisely controlling his torso posture and center of gravity fluctuations, Su minimized energy loss in the vertical direction and focused all his power on horizontal displacement. This 'precise posture control + efficient power generation' mode made his 0.84-second speed quality far exceed that of Moscow and gave him the potential to accelerate in the later stages."

Green nodded, and a larger, bolder font and paragraph breaks began to appear—

This 10-meter section from both races:
Moscow World Championships, 70-80 meters, 0.88 seconds.

Beijing National Stadium (Bird's Nest) World Championships 70-80m, 0.83 seconds.

This 0.05-second difference is never a simple reduction in time, but rather the ultimate showdown between two completely opposing sprinting logics.

No matter how many times I watch it, it always makes Green feel...

Dazzled.

incredible.

But he already truly exists.

Compared to the 70-80 meter segments at the Bird's Nest this time, the 0.88 seconds in Moscow was more like a "10-meter rout" – a sudden explosion of hidden dangers, a complete collapse of the power generation system, and a precipitous drop in speed.

BJ's 0.83 seconds suddenly became a "10-meter comeback" – a testament to the full effectiveness of technological restructuring, the seamless closed loop of power transmission, and the return of speed to its peak.

What is even more worthy of worship is...

These 10 meters at the Beijing National Stadium (Bird's Nest) created an extremely rare double-peaked speed curve in the history of human sprinting—

50-60米率先触及0.83秒的极速峰值，60-70米以0.84秒小幅过渡蓄力，并未陷入绝大多数运动员“前峰过后必减速”的宿命，反而在70-80米逆势折返……

It has returned to its peak speed of 0.83 seconds.

This bimodal top speed, in the previous history of human sprinting, existed only in theoretical deductions of sports biomechanics. Whether it was Usain Bolt's "single-peak top speed throughout the middle and later stages," Tyson Gay's "rapid decay after the initial peak," or the conventional curve of "a single peak speed followed by a gradual decline" for all top sprinters, no one has ever been able to break through the physiological constraints and mechanical inertia of "entering a deceleration cycle after a single peak speed."

But Su Shen did it.

The 0.83-second jump of 70-80 meters at the Beijing National Stadium (Bird's Nest) was not a "chance rebound" or a "lucky continuation of inertia," but rather the inevitable result of two years of technical reconstruction and rigorous refinement.

It is the culmination of his transformation from starting with his right foot to starting with his left foot, from using his lower limbs as the primary source of power to using his whole body in a coordinated manner, and from a passive inertial running method to an active endurance running method.

Green took a deep breath before continuing:
“We always adhere to a core premise, which I want to emphasize again: the so-called 70-80 meter gap is never an ‘isolated problem’ in this section of the race, but rather the ultimate manifestation of the technical accumulation in the 50-60 meter and 60-70 meter sections.”

“莫斯科的0.88秒，是50-60米被动惯性、60-70米衔接断裂的“恶果”；BJ的0.83秒，则是50-60米高效发力、60-70米无缝衔接的“善果”。这10米，是检验两段赛事技术体系优劣的终极试金石。”

"In the biomechanical system of the 100-meter sprint, the 70-80 meter mark is an extremely special segment: it is at the critical point between the end of the acceleration phase and the beginning of the high-speed endurance phase, and it is the ultimate watershed between the ability to exert force and the ability to maintain speed."

“对于绝大多数顶尖短跑选手而言，这段赛段的核心逻辑的是“守住极速”——守住50-60米、60-70米积累的极速峰值，尽量减少速度衰减，为80-100米的末端冲刺预留发力空间。”

"However, this statement is more directed at runners in the later stages of the race. If it is runners in the early stages, it will be even more difficult for them to withstand the pressure."

"For example, the 70-80 meter section of the Sumosk track is a path of complete defeat, where Sumosk was 'completely eliminated from the speed range'."

"My core positioning for it is that the acceleration cycle has completely ended and the passive deceleration has been fully launched."

"The top speed of 0.83 seconds in the 50-60 meter range and the passive maintenance of 0.84 seconds in the 60-70 meter range are completely swallowed up in this 10-meter section, with the speed dropping by 0.04 seconds and the attenuation rate as high as 4.76%. Such a degree of attenuation is extremely rare in the middle and later stages of the race for top athletes."

"This 0.88 seconds was never a 'barely maintained' moment, but rather a moment when Su's body had begun to 'completely collapse'—the power chain broke, neuromuscular coordination went out of control, energy consumption reached its peak, and horizontal propulsion was completely insufficient. Every step was a passive push-off, and every exertion of force was an ineffective consumption."

"Therefore, after this section, the 80-meter mark completely became the starting point for slowing down. The 0.87 seconds between 80 and 90 meters was a passive adjustment, and the 0.88 seconds between 90 and 100 meters was a complete loss. The speed curve throughout the race fell into a vicious cycle of 'precipitous decline + disorderly fluctuation'."

"Compared to Moscow, BJ's 70-80 meters is a story of a comeback against all odds, a return to the top."

Green began to get excited, after all, he had never seen such a legendary rank before.

His commentary was, of course, exceptionally passionate.

"My core positioning here is that the acceleration cycle continues to extend and the peak speed is bloomed a second time."

“50-60米0.83秒的第一次极速峰值，60-70米0.84秒的精准蓄力过渡，在这段10米内完成“完美折返”，然后……重新回归0.83秒的极速峰值！实现“极速不衰减、蓄力即回归”的史诗级表现！”

"In the next ten meters, we will not dwell on the superficial time difference, but will comprehensively break down the differences between the two 70-80 meter sections, accurately analyze the advantages of the Beijing Bird's Nest and the fatal shortcomings of the Moscow event. We will reject any quantitative data throughout the process, only delve into the principles of biomechanics, focus on the core logic of 'speed drop' and 'rapid recovery', and make sure that every dimension is a contrast between advantages and disadvantages, and accurately benchmark against each other."

"Otherwise, no one will understand it, right?"

After making a joke, Green began explaining the most important chapter.

"This is the most fundamental difference between the two 10-meter segments, and the core reason for the 0.05-second difference—Moscow's effort is a 'passive last resort,' while BJ's effort is an 'active sustain.'"

"Moscow World Championships 70-80m: Passive compensation, no initiative in exertion. This 0.88-second burst of power was essentially an 'instinctive compensation after the disordered exertion before 70m,' without any logic of actively accelerating or maintaining top speed. The interruption of the power transition and horizontal thrust in the 60-70m range resulted in the loss of the ability to actively propel the vehicle after 70m."

"At this point, Su was essentially 'gliding along with the inertia from the previous stage,' and his push-off action changed from 'active propulsion' to 'passive push-off.' The core purpose of using his hip, knee, and ankle was not to 'increase speed,' but to 'maintain body balance' and avoid falling due to imbalance in force. This passive compensatory force mode caused him to be unable to generate effective horizontal propulsion with each subsequent push-off, instead consuming more residual inertia, ultimately causing his speed to plummet to 0.88 seconds."

"More fatally, this passive compensatory exertion will further aggravate neuromuscular fatigue, further disrupt the coordination of the exertion chain, and form a vicious cycle of 'the more passive the exertion → the slower the speed → the more severe the fatigue → the more passive the exertion,' which is also the core reason why the attenuation rate of this stage is so high."

"In contrast, the 70-80 meter time of the Beijing World Championships at the Bird's Nest was 0.83 seconds, but it was a proactive push, and the effort was controllable and sustainable throughout the entire race."

"This 0.83-second burst of power is essentially a continuation and upgrade of the active power generation from 50 to 60 meters and 60 to 70 meters, and a rapid return after accumulating power. Every push-off is a purposeful, intense, and efficient active propulsion. The technological innovation of starting with the left foot has completely solved the power generation dead zone of starting with the right foot. The seamless transition from 60 to 70 meters allows the ability to actively accelerate after 70 meters."

"At this moment, Su's power generation logic is very clear: the 0.84 seconds between 60 and 70 meters is not a deceleration, but a 'precise power accumulation'—slightly adjusting the intensity of the power generation and optimizing the torso posture to reserve power generation space and store elastic potential energy for the extreme speed return at 70 to 80 meters. After 70 meters, the power generation of the whole body is fully launched in coordination. The core purpose of pushing off the ground is to 'return to extreme speed and continue extreme speed'. Every push off the ground is precisely focused on horizontal displacement, and every power generation perfectly inherits the speed inertia of the previous segment."

"Ultimately achieving an ultra-fast return time of 0.83 seconds."

"This proactive approach to power generation creates a virtuous cycle of 'more proactive power generation → more stable speed → less energy loss → more proactive power generation,' which is the core prerequisite for the formation of the dual-peak high-speed system."

"This is why I have repeatedly emphasized that we were passive in Moscow but proactive here at the Bird's Nest. The core reason is that without proactive support, any rapid return is just empty talk."

The essence of exerting force: passive compensation vs. active pushing.

This was highlighted as the first point by Green on his live stream screen.

"The power generation in sprinting is never about 'the lower limbs exerting power alone,' but rather about 'the efficient transmission of power throughout the body'—the core is the 'central hub of power transmission,' with the upper limbs acting as 'auxiliary synergy for power generation,' and the lower limbs being the 'core source of power generation.' The power transmission efficiency in the two 70-80 meter segments is worlds apart, which is also the key to the speed difference."

"At the Moscow World Championships, in the 70-80 meter section, a time of 0.88 seconds, power transmission completely broke down, and energy leakage reached its peak. The logic of power transmission in this segment in Moscow was 'fragmented, disordered, and inefficient.' The loss of control over pelvic rotation and insufficient core stability caused by the start completely erupted in this segment. The core muscles were unable to lock the torso posture, becoming a 'loophole in power transmission' rather than a 'hub in power transmission.'"

"Specifically, 25% of the power generated by the lower limbs pushing off the ground is wasted in the back-and-forth swaying of the torso due to core instability, 15% is wasted in ineffective arm movements due to inefficient upper limb swing, and another 10% is wasted in unconscious joint rotation due to the disconnection of the hip-knee-ankle power chain. In other words, in the Moscow stage, only 50% of the power generated by Suarez's lower limbs pushing off the ground was converted into effective forward momentum, while the remaining 50% was completely wasted."

"What's even more frightening is that the break in power transmission is not a 'local break,' but a 'complete break'—from the lower limbs pushing off the ground to the core transmission and then to the upper limb coordination, there is leakage in every link, and every link cannot be effectively connected. This all-round power leakage causes the horizontal propulsion to continue to decline, making it unable to counteract air resistance and ground friction, and the speed can only drop precipitously."

"In comparison, look at this segment in BJ. The logic of power transmission is 'closed-loop, orderly, and efficient.' The controllable pelvic rotation brought about by the left foot start and the trunk stability brought about by the strengthening of the core muscles make the core the 'central hub of power transmission,' achieving a seamless connection of 'lower limb push-off → core transmission → upper limb coordination,' without too many power leakage loopholes."

"After two years of strength training and technical adjustments, Su's core muscles can firmly lock the pelvic posture, preventing the torso from swaying back and forth. The power generated by the lower limbs pushing off the ground can be efficiently transmitted to the whole body through the core. The amplitude and speed of the upper limb swing are perfectly synchronized with the lower limb push-off, forming a synergistic effect of 'upper limbs leading lower limbs and lower limbs promoting upper limbs.' The inertial torque generated by the upper limb swing becomes an important supplement to the horizontal propulsion force."

"In other words, in the section of the race at the Bird's Nest, more than 85% of the force generated by Su's lower limbs pushing off the ground can be converted into effective forward momentum, with only a small amount of 15% being lost. Of course, this is also necessary. As long as there is air, people are running and there is still unavoidable air resistance and friction loss from the ground."

"This seamless closed-loop power transmission keeps the horizontal propulsion at a high level, perfectly supporting the 50-60 meter high-speed inertia, effectively countering various resistances in the later stages, and ultimately achieving a high-speed return. The efficiency of power transmission is the foundation of the high-speed return."

"If Moscow's power transmission is like a 'leaky hole,' where no matter how much effort is put in, it's all in vain, then BJ's power transmission is like a 'seamless closed loop,' where the effort is precise and twice as effective. The difference in the efficiency of power transmission is a crushing difference at the biomechanical level, and I believe it is also one of the core achievements of the Soviet Union's technological innovation in the past two years."

He hesitated slightly before saying "one of," because then Green realized, "Wow, its core technological innovation..."

Where is there only one?
Even a random count reveals a huge number.

They just throw it out like it's free.

Who can withstand this?

If I didn't add "one of," I'd feel like I was just being perfunctory.

This is called force transmission.

Fault leakage vs. seamless closed loop.

Then comes the challenge of neuromuscular coordination disorder and loss of control versus synchronized and efficient coordination.

Beijing Bird's Nest World Championships 70-80 meters (0.83 seconds): Highly efficient neuromuscular coordination and seamless activation sequence. The start completely followed Su Bingtian's body instinct of "right foot first". This "instinctive" technical mode showed the ultimate neuromuscular coordination efficiency in the fatigue critical period of 70-80 meters.

After two years of segmented running training and muscle memory reconstruction, Su's neuromuscular system has developed an "automatic coordinated response."

50-60米、60-70米、70-80米的肌肉激活顺序，始终是“同步激活、有序收缩”。

The gluteal muscles, quadriceps femoris, gastrocnemius, tibialis anterior, as well as the core muscles and upper limb muscles.

Every muscle engages at the right time, and every contraction is precisely matched to the acceleration needs.

More importantly, this highly efficient neuromuscular coordination can effectively delay muscle fatigue, reduce the impact of lactic acid buildup, and keep the peak force of the push-off at a high level. The accuracy of the force exertion and the stability of the speed will not deviate at all throughout the entire process.

This virtuous cycle of "high efficiency through collaboration → precise exertion → stable speed → even higher efficiency through collaboration" is the core neurophysiological basis for the formation of the dual-peak high-speed circuit.

Without automated muscle memory and efficient neural coordination, there would be no 70-80 meter rapid return.

The pros and cons can be summarized as follows:

The neuromuscular coordination in Moscow is a "counter-instinctive disorder," becoming increasingly stiff and out of control the longer one runs.

BJ's neuromuscular coordination is "efficient by following instinct," becoming smoother and more precise the more he runs.

Add to that the issue of torso posture, the difference between an upright stance and precise lock-on.

In terms of energy efficiency, there is inefficient consumption versus efficient utilization.

In terms of potential for later stages, it's a complete collapse versus sustained momentum.

……

"Prior to this, the extreme speed curves in the history of human sprinting only had three conventional forms:"

"The first type is the single-peak extreme speed type. It reaches the peak speed at 50-60 meters, and then maintains the extreme speed with a very small decay rate. It maintains a speed close to the peak speed throughout the 60-100 meter range. There is no second extreme speed return, only 'single-peak penetration'."

"The second type is the peak decay type, where the speed reaches its peak at 50-60 meters, and then the speed gradually decreases. There is no rebound in the later stage, and the decay rate gradually increases. This is the normal curve for most top athletes."

"The third type is fluctuating speed, with disordered speed fluctuations in the middle and later stages, with slight rebounds, but never reaching the first peak speed. Essentially, it is a passive adjustment after the force exertion is disordered, rather than an active return."

"The fourth type... is Su's type."

"Su's bimodal extreme speed is the fourth type, and also the first truly bimodal extreme speed form in human history."

“是50-60米第一次峰值（0.83秒）→60-70米小幅蓄力（0.84秒）→70-80米第二次峰值（0.83秒），两次峰值完全一致！衔接流畅，蓄力精准，回归高效。”

"No athlete in the history of human sprinting has ever been able to achieve this form, not even legendary athletes like Bolt and Gay, who could not break through the physiological constraint of 'one peak acceleration is the final acceleration'."

"This is the most significant milestone in this 10-meter stretch."

"This is the core value of the 70-80 meter jump at the Beijing National Stadium, which is 0.83 seconds, surpassing all other records and all gaps."

"This is also the most precious legacy that Su left to the history of human sprinting!"

"It was precisely because of this that he was able to make a significant leap forward in the later stages of his career."

"On a track with a headwind of half a meter, this resulted in a better finish time."

"Having improved by 0.01 seconds in the early stages, the later stages saw a significant leap of 0.05 seconds..."

"How a 9.49-second time in a major competition was achieved."

"That's the answer."

"This is……"

"Su's answer!"

(End of this chapter)