The Su God of the Reopening of the Sports Arena

Chapter 2521 This is why Bolt will never master the ultimate speed.

Chapter 2521 This is why Bolt can never master the Extreme Return.

What is meant by rapid recovery?
The moment that word was uttered, it completely shocked the audience.

I don't know how serious it is.

After all, most people don't understand what this means.

This is exactly the effect Green wanted.

Otherwise, if everyone knows, how can I show off like this?
How can I then sell this sense of superiority?

"To understand what rapid return to speed means, we first need to consider a concept called the 'six-second rule'," Green said, pleased with the various expressions of surprise, doubt, and interaction from the viewers in the live stream. He continued, "The 'six-second rule' didn't arise out of thin air. Its theoretical foundation stems from the formula for the relationship between instantaneous velocity and time proposed by American physiologist A. Higgin in 1936: v=Vm(1-ekt). This formula precisely reveals the functional relationship between an athlete's instantaneous velocity and maximum velocity (Vm), as well as the dynamic law of velocity change over time. Based on this, sports researchers, through statistical analysis of measured data from sprinters of different levels, discovered a common pattern: regardless of an athlete's overall competitive level, when running at full speed, they inevitably reach their personal maximum speed around the 6th second. No athlete reaches their peak speed before 6 seconds, and almost no one reaches their maximum speed after 6 seconds. This common characteristic, transcending differences in competitive level, is defined as the 'six-second rule' in the field of sprinting."

"The essence of the six-second rule is a mapping of the objective laws of the human body's sprinting energy supply system. Sprinting uses anaerobic metabolism as its core energy supply mode, in which the phosphagen system is the core energy source for speed generation. The amount of ATP stored in human muscles is very small, which can only sustain high-intensity exercise for 1-2 seconds. CP, as the immediate regeneration material of ATP, has a content ratio of about 3:1 with ATP. The phosphagen system, which is composed of both, has an energy supply limit of exactly 6-8 seconds."

"During this period, energy supply does not require oxygen, the reaction speed is extremely fast, and no fatigue intermediate products such as lactic acid are produced, which can provide muscles with continuous high-intensity power output."

"When exercise lasts longer than 6-8 seconds, the phosphagen system gradually depletes, and the anaerobic glycolysis system begins to dominate the energy supply. At this time, while muscle glycogen is broken down to produce energy, a large amount of lactic acid accumulates, leading to an increase in the concentration of hydrogen ions in the blood and a decrease in pH value. This, in turn, affects the activity of calcium ions, inhibits muscle contraction ability, and ultimately causes a decline in speed. The six-second rule precisely corresponds to the peak energy supply period of the phosphagen system. Around 6 seconds is not only the point where energy supply is most abundant, but also the 'golden moment' when muscle contraction efficiency is highest and fatigue has not yet appeared."

"As everyone knows, the 100-meter race can be divided into four stages: the start (0-10 meters), the acceleration (10-50 meters), the middle stage (50-80 meters), and the sprint (80-100 meters). The speed characteristics of each stage have a strict time correspondence with the six-second rule. According to the speed data model of elite athletes, 0-10 meters is the starting acceleration stage, where the body breaks through inertia from a static state, and the speed rises rapidly but has not yet entered a stable acceleration period; 10-50 meters is the rapid acceleration stage, where the phosphagen system provides full energy, and the stride frequency and stride length increase simultaneously, and the speed increases exponentially; around 50-60 meters (about 6 seconds), the athlete first reaches the peak speed, at which time the phosphagen system reaches its peak energy supply, and the muscle contraction efficiency is maximized; 60-80 meters is the speed maintenance stage, where if the energy distribution is reasonable and the technique is stable, a significant drop in speed can be avoided; 80-100 meters is the sprint stage, where lactic acid accumulation causes fatigue in the traditional mode, and the speed will naturally decrease, but under ideal conditions, it is still possible to maintain or even increase the speed again through neuromuscular regulation."

"Although the concept of a double-peaked speed is theoretically feasible, there has never been a clear record of it in the history of human sprinting before the 2021 Tokyo Olympics, and the core reason for this is..."

"The problem lies in the fact that the 'multiple conditions superimposed' required by the theory are difficult to achieve in practice."

"Specifically, we also need to take into account the actual level of performance and the actual conditions for performance."

"The first point, in my opinion, is the limitation of the training concept, the path dependence of the excessive single-peak speed pattern over such a long period of time."

"For a long time, the core concept of sprint training has been to maximize a single peak speed and delay decay, rather than to pursue dual-peak optimization. This path dependence has led to the solidification of athletes' technical movements and energy distribution patterns. In traditional training, coaches pay more attention to starting acceleration ability (0-30 meters) and maximum speed (usually occurring in 50-60 meters). Training methods focus on improving absolute strength in a short period of time (such as heavy-load sled pushing, short-distance weighted sprints) to optimize the start, and improving lower limb power (such as snatch, fast squat jumps) to maintain acceleration."

“In this training model, athletes’ muscle memory and neural regulation patterns are built around the ‘single peak’: during the acceleration phase, they maximize stride frequency and stride length, and after reaching the peak, they rely solely on muscle endurance to maintain speed, lacking technical training and neural adaptation for ‘secondary optimization’. For example, traditional training rarely conducts specific stride length regulation training in the 60-80 meter range, nor does it systematically cultivate athletes’ neuromuscular secondary activation ability in the early stages of fatigue, causing athletes to naturally enter a ‘speed maintenance’ state after 60 meters, rather than a ‘secondary acceleration’ state.”

"The second point, in my opinion, is the constraint of physiological limits, individual differences, and the difficulty of fatigue regulation."

Green continued clicking, and a PowerPoint presentation prepared by his team popped up on the screen.

"The formation of bimodal speed places extremely high demands on the physiological functions of athletes, and such 'ultra-high standards' were difficult to fully meet among athletes before Su."

The screen displayed the following text:
1. The dual threshold of fast-twitch muscle fiber percentage and neuromuscular efficiency.

Achieving a biphasic speed requires athletes to not only possess a high proportion of fast-twitch muscle fibers but also exceptional neuromuscular recruitment efficiency and fatigue resistance. Athletes with an insufficient proportion of fast-twitch fibers will have limited initial peak speed at 60 meters; while athletes with insufficient neuromuscular efficiency, even with a high proportion of fast-twitch fibers, will struggle to achieve secondary activation under fatigue. For example, some athletes may reach high speeds at 60 meters, but due to insufficient neuromuscular control, muscle coordination efficiency declines after 60 meters, disrupting the stride frequency-stride length balance and preventing the formation of a second peak speed.

2. Precise control of lactate tolerance and energy distribution.

The second peak at 80 meters requires athletes to precisely control the rate of lactate buildup, maximizing the use of glycolysis before the phosphagen system is depleted. This demands extremely high lactate tolerance and precise energy allocation—avoiding both excessive energy expenditure during acceleration leading to premature fatigue and overly conservative approach in the middle of the race, thus wasting speed potential. Before Su, most athletes' energy allocation pattern was "full acceleration in the first half and passively maintaining speed in the second half," lacking precise energy control during the "60-80 meter critical period."

At this moment, someone typed a question on the screen: Isn't Bolt talented enough?

Upon seeing this, Green nodded to his team members and immediately brought up the issue, saying:
"Your question is extremely insightful—Bolt's talent is absolutely at the pinnacle of human sprinting history, and his individual superiority is unmatched..."

"But he couldn't achieve the Soviet-style 'double-peak speed.' The core answer isn't 'insufficient talent,' but rather three points: 'different speed patterns suited to different talents,' 'different physiological biases,' and 'different training philosophies of the era.'"

“Even Bolt’s ‘talent advantage’ itself became a ‘hidden limitation’ preventing him from achieving bi-peak speed.”

These words were truly outrageous.

It almost caused an uproar in the live stream.

I thought Green was starting to talk nonsense.

They ruined their own reputation.

What does it mean when one's innate talent actually limits them?
Isn't that nonsense?

Actually it is not.

Green's answer was given after analysis and team research.

First, we need to clarify a premise: the core of the dual-peak speed is "two accelerations + two peaks", while Bolt's speed pattern is "one extreme peak + a very long peak plateau period + slow decay". The two are essentially two completely different speed logics, and there is no superiority or inferiority between them.

However, the physiological talents and technical training philosophies that match them are completely different. Bolt's talent was born for "extreme single-peak + long-distance high-speed endurance", rather than "two-stage secondary activation".

Bolt's neuromuscular system excels at "one-time extreme recruitment + long-term stable maintenance", rather than "secondary high-intensity recruitment under fatigue".

First--

The core physiological logic of bimodal velocity is "first recruitment of fast-twitch muscle fibers at 60 meters → temporary retention of some fast-twitch muscle fiber reserves → second high-intensity recruitment of the remaining reserves at 80 meters". This requires the neuromuscular system to have "precise "recruitment-leave-re-recruitment" control ability", which is essentially a "refined segmented control".

second--

Bolt's neuromuscular control mode is "starting from the acceleration phase, gradually increasing recruitment efficiency → reaching 100% peak recruitment at 50-60 meters → maintaining this recruitment efficiency until 70-75 meters". In other words, Bolt has almost exhausted the recruitment potential of fast-twitch muscle fibers at 60 meters, leaving no fiber reserve for "secondary activation".

Why is this? The core reason is Bolt's "physiological adaptability brought about by his height and body type" - he is 1.96 meters tall, a "giant exception" in the history of sprinting.

For tall athletes, the core challenge in sprinting is to "overcome their own center of gravity inertia and achieve high-speed and stable running." Therefore, the core of their neuromuscular system evolution, or training adaptation, is to "maintain the coordinated balance of all muscle groups and avoid imbalance of the center of gravity at high speeds," rather than "forcibly accelerating again when fatigued."

To give a straightforward example:
Su is about 1.80 meters tall and has a compact build. His neuromuscular system can act like a "precise switch," turning on and off at will. He can hold back at 60 meters and unleash his full power at 80 meters.

Bolt's height and build mean his neuromuscular system is more like "a high-powered engine." Once it reaches its maximum speed, it can only maintain that speed and cannot suddenly "upshift" while maintaining the same speed.

It’s not that it can’t be done.

Rather, it is his physique and center of gravity control that prevent such a "secondary emergency recruitment".

Otherwise, it will directly disrupt the body's balance, causing a sudden drop in speed or even a fall.

In addition, Bolt's "fatigue resistance" is "endurance-type fatigue resistance," rather than "secondary exertion-type fatigue resistance." His advantage is that even when his fast-twitch muscle fibers are recruited to the maximum, he can slow down speed decline through his superb muscle endurance (for example, his speed in the 70-80 meters is only 0.1 m/s lower than his peak speed, while that of ordinary athletes is 0.3-0.5 m/s lower). This is the core reason why he can overwhelm his opponents in the second half of the 100-meter race. Suarez's fatigue resistance, on the other hand, is "sudden bursts of power to combat fatigue in the early stages of fatigue"—he can suddenly exert force to accelerate again after 60 meters when lactic acid begins to accumulate and fast-twitch muscle fibers show slight fatigue. This type of fatigue resistance is completely different from Bolt's "endurance-type" fatigue resistance.

This isn't a question of superior or inferior talent, but rather a question of the suitability of different talent types. Bolt's neuromuscular talent is tailor-made for "extreme single peak + extremely long plateau period," while dual-peak speed requires a talent of "two-stage recruitment + secondary burst." The two can coexist without conflict, but they are incompatible.

Secondly, Green wrote—

Bolt's lactate tolerance and energy allocation: "Conserving energy in the first half of the race ≠ Critical period regulation", which is essentially the choice of speed mode.

In short: Suarez's energy allocation is a "refined two-stage power delivery"; while Bolt's energy allocation is a "compensatory one-stage power delivery + endurance" approach.

More importantly, Bolt's phosphate generator system actually provides energy for a longer duration than Suarez's, which is also his natural advantage.

Therefore, his peak speed can be maintained at around 75 meters per second, while Su's first peak speed was at 60 meters per second. This means that Bolt's "power supply critical period" is 75-85 meters per second.

The critical period for Su is 60-80 meters.

The "secondary acceleration windows" for the two are completely staggered.

When Su achieved his second peak at 80 meters, Bolt was in the early stages of "the phosphagen system being completely depleted and the glycolysis system taking over completely." At this time, his core task was "to combat lactic acid buildup and maintain speed," rather than "to accelerate again."

It's not that he can't do it, but rather that his energy allocation window and speed mode simply don't leave any room for a "secondary acceleration".

Why is it said that there was absolutely no room left for a second acceleration?
That's the reason. The six-second rule has already explained it very clearly: after this time, no matter who you are, your phosphate energy supply has reached its limit.

Therefore, even if Bolt exceeds this range, it is impossible for him to increase his speed further.

You can't say that Green's analysis is wrong.

But if we let Su Shen see it himself...

You'll find that what Green is actually talking about is still some theoretical knowledge about the second-degree maximum velocity regression.

No new achievements were made.

In fact, Bolt can't do that, except for these points.

The remaining points are equally important.

For example, "the irreversible closed loop of neuromuscular recruitment".

Bolt's recruitment model is a "one-time lock-in," with no physiological space for secondary activation.

The core premise of bimodal velocity is the "segmental reversibility of neuromuscular recruitment":
Sussin's first peak at 60 meters was due to the selective recruitment of some fast-twitch muscle fibers. The central nervous system deliberately retains a portion of high-threshold motor units, and the core innervation units of fast-twitch muscle fibers reserve space for "secondary recruitment." This recruitment mode is "precise screening and on-demand release," which is essentially the neuromuscular "refined hierarchical control capability."

Bolt's neuromuscular recruitment pattern is an irreversible, one-time locked closed loop. This is not due to insufficient regulatory ability, but rather because his speed pattern forces the neural center to form a "physiological necessity adaptation".

Bolt's peak speed (above 46 km/h) is the ceiling in the history of human sprinting. The generation of such speed requires the synchronous and comprehensive activation of high-threshold motor units throughout the body. His nerve center had already recruited all the high-threshold motor units corresponding to all fast-twitch muscle fibers by around 55 meters (slightly earlier than 60 meters), and there was no possibility of "reserving reserves".

More importantly, this "full recruitment" is physiologically irreversible:
Once the high-threshold motion units are synchronously activated.

The release of acetylcholine at the neuromuscular junction reaches its peak.

A large amount of calcium ions are released from the sarcoplasmic reticulum.

Muscle contraction forms a "tetanic contraction homeostasis".

At this point, the nerve center can no longer perform "secondary recruitment".

It's not that I don't want to, but on a physiological level, the signal transmission at the neuromuscular junction has reached a "saturation point".

It is no longer possible to enhance the signal.

To activate the remaining fibers.

In fact, there were no fibers left to activate. On the other hand, Su himself experienced an initial peak of "partial activation of some high-threshold motor units," with the neuromuscular junction signal transmission in an "unsaturated state."

At a distance of 60-80 meters, simply increasing the signal discharge frequency can activate the remaining reserve motion units, forming a secondary peak.

Bolt's "saturation recruitment" cuts off the possibility of secondary activation from a physiological perspective.

This is the fundamental irreversibility of neuromuscular regulation.

Rather than differences in regulatory capacity.

Secondly, there is the "misalignment of the energy supply timing of the phosphagen system"—Bolt's peak energy supply is completely out of sync with the dual-speed window.

The core of the six-second rule is that "around 6 seconds is the peak energy supply of the phosphagen system," and the key to the double-peak speed is the "two-stage superposition" of the energy supply of the phosphagen system.

Sushen can achieve this by precisely controlling the energy supply of the phosphagen system, splitting it into "the initial energy supply peak at 60 meters + the secondary energy supply tail peak at 75-80 meters".

This is the "initial energy supply of the energy supply tail peak superposition glycolysis system".

That's how the second peak speed was achieved at 80 meters.

This is something Bolt is completely unable to achieve.

It's not talent.

The core issue is the timing of his phosphagen system's energy supply.

It was completely locked down by his speed mode misalignment.

This creates a physiological closed loop of "peak energy supply being exhausted in advance and peak energy supply being completely absent".

This is indeed caused by many physiological conditions.

For example, Usain Bolt is 1.96 meters tall, and his lower limb muscle mass far exceeds that of Suarez. Although his total phosphagen system storage is much higher than Suarez's, his "energy consumption rate" is more than 1.3 times that of Suarez.

Each muscle contraction he makes requires more ATP-PC.

To overcome its greater center of gravity inertia and muscle load.

More importantly, Bolt's phosphate generator system consumes more than 70% of its energy at around 65 meters, entering a "power supply depletion period," and there is no "power supply peak at 75-80 meters."

However, the phosphagen system of this sulphurin still has a 30% reserve.

It just happens to be able to superimpose the energy supply of the glycolysis system.

This leads to a second acceleration.

Simply put, Usain Bolt's phosphagen energy supply is a "gradual, two-stage release"; while Bolt's phosphagen energy supply is a "one-time depletion like a gluttonous feast." This misalignment in the timing of energy supply is a fundamental gap at the metabolic level, which cannot be compensated for by "precision in energy allocation." Even if Bolt deliberately slows down his speed in the first 60 meters, he cannot change the high energy consumption rate brought about by his muscle mass. The lack of a peak energy supply fundamentally negates the possibility of a second peak speed.

Another point is the "explosive inflection point" vs. "gradual climb" of lactate accumulation—Bolt's lactate threshold trigger was right at the critical period of dual extreme speeds.

Suarez's lactate buildup is a "gradual climb," while Bolt's lactate buildup is an "explosive inflection point." The inflection point for both is precisely at the critical period of dual extreme speeds between 60 and 80 meters. This is the core physiological constraint that prevents Bolt from achieving a second acceleration.

The core logic here is:

Bolt's lactate threshold trigger point falls precisely within the 60-80 meter secondary acceleration window.

When Suarez used "subthreshold lactate" to help him accelerate again at 80 meters, Bolt was experiencing "muscle contraction inhibition after lactate concentration exceeded the threshold"—the contraction efficiency of his hamstrings and quadriceps began to decline, the speed of muscle relaxation slowed down, and the support time was slightly prolonged. At this time, his core physiological task was to "counter lactate inhibition and maintain the current speed", rather than to accelerate again.

More importantly, while Bolt's lactate clearance rate far exceeds that of ordinary athletes, his "lactic acid production rate" is 1.25 times that of Suarez.

This imbalance of "production > elimination" reaches its extreme at the critical period of 60-80 meters, forming a "lactic acid inhibition closed loop"—this is not due to insufficient lactic acid tolerance, but rather its rate pattern, which causes the inflection point of lactic acid accumulation to just lock the window for a second acceleration.

Finally—

"A 'dual-consumption closed loop' of muscle elastic potential energy and fascial conduction."

Bolt has no elastic reserves and cannot replenish the mechanical energy needed for a second acceleration.

The secondary acceleration of the bimodal velocity, in addition to neuromuscular activation and energy supply, also has a core physiological and mechanical underlying logic: at 60-80 meters, the lower limb connective tissue (tendons, ligaments) and the whole body deep fascia system work together to achieve "secondary rebound replenishment" of elastic potential energy.

Suarez's ultimate heel recovery and swing folding technique is essentially about "maximizing the storage and graded release of elastic potential energy in the fascia-tendon complex." This secondary replenishment of elastic potential energy can significantly reduce the energy consumption of active muscle contraction, injecting mechanical power into secondary acceleration—something Bolt absolutely cannot achieve, because his muscle elastic potential energy + fascia conduction efficiency together form a double closed loop of "one-time exhaustion," leaving no elastic reserves whatsoever.

Su Shen has a compact and strong physique, with an extremely high "elasticity coefficient" in the connective tissue of his lower limbs. More importantly, his entire deep fascia system, especially the deep fascia of the calf, the fascia lata of the thigh, and the hamstring fascia, is very well developed and is in a highly tight and resilient synergistic state.

His stride was moderate, and each step he took was a "lightly loaded, elastically cushioned" landing.

When the swinging leg folds, the Achilles tendon and gastrocnemius tendon stretch rapidly, while the deep fascia of the calf tightens simultaneously, forming a "fascia-tendon elastic energy storage network".

After the initial peak at 60 meters, this elastic potential energy is not released all at once, but is released in segments through the "gradual conduction" of the fascia.

When accelerating again at 80 meters, the elastic potential energy of the fascia-tendon complex rebounds twice, which just superimposes the muscle contraction force to form a second peak speed.

More importantly, Suarez developed his fascia system from a very young age, making him the first person in the world, and even the first among all athletes, to scientifically develop his fascia system in sprinting.

Therefore, his fascial adhesions were extremely low.

The sliding efficiency between the fascia is extremely high.

It can minimize the loss of elastic potential energy during the transmission process.

This ensures that every bit of stored elastic potential energy can be precisely converted into propulsion.

This is his "core advantage at the fascia level" for his second acceleration.

Bolt is tall, standing at 1.96 meters and weighing 99 kg. The "load strength" of his lower limb connective tissue far exceeds that of Suarez, and the shortcomings in the adaptability of his fascial system further exacerbate his loss of elastic potential energy.

Each of his strides reaches 2.85 meters. When he lands, his Achilles tendon and gastrocnemius tendon have to bear the triple load of "body weight + muscle contraction force + center of gravity inertia". At the same time, the entire deep fascia system needs to be tightened synchronously to maintain the stability of the body at high speed. Under this extreme load, the "elastic potential energy storage-release" of his fascia-tendon complex is "completed in one go".

When he first began to gradually reach his peak at 55-60 meters, the elastic potential energy of the connective tissue in his lower limbs had been fully released, and the deep fascia system quickly switched from a "tight energy storage state" to a "relaxed fatigue state".

After 60 meters, tendons and ligaments are in a period of elastic fatigue, and the conduction efficiency of the deep fascia drops sharply. Not only can it no longer store enough elastic potential energy, but it will also consume more of the remaining mechanical energy due to the increased sliding resistance between the fascia.

More importantly, Bolt has a huge amount of lower limb muscle mass. During the long-term absolute strength training, the explosive growth in muscle size led to adaptive thickening and increased adhesion of the deep fascia. Even at low speeds, the elastic transmission efficiency of the fascia is much lower than that of Suarez. This irreversible adaptation at the fascial level further locked up his possibility of secondary replenishment of elastic potential energy.

Of course, the most important thing is that Bolt doesn't actively activate his fascial system.

This makes his and Su Shen's effects completely different when using fascia for assistance.

More importantly, the force of Bolt's active contraction of his lower limb muscles has completely overshadowed the replenishment effect of elastic potential energy and fascial conduction. Over time, his connective tissue elasticity and fascial toughness have experienced "physiological adaptive weakening".

Because of his speed mode, he doesn't need a secondary supply of elastic potential energy; the force of active muscle contraction is enough to maintain peak speed.

This dual closed loop of "one-time consumption of elastic potential energy + one-time attenuation of fascial conduction efficiency" forms the "mechanical energy gap" for Bolt's second acceleration:
Without the secondary rebound energy replenishment from the elastic potential energy of the fascia-tendon complex, relying solely on active muscle contraction under the dual conditions of lactate inhibition and phosphogen energy depletion,

A second acceleration is simply out of the question.

What Green said, plus these points that Green and the rest of the world don't know yet.

They are arranged together.

This explains why Bolt can never actually achieve a lightning-fast comeback.

It's not just because of his running style and height that he can't suppress the final energy supply point in the phosphate energy system.

We will inevitably miss this opportunity.

Secondly, his training method completely lacks a fascia system.

They didn't even have the concept of contact.

such.

Even when training with Su Shen.

Rapid return.

He couldn't master it either.