Badminton Is Becoming a Sport of Lungs, No Longer a Sport of Wrists

In the semifinal of the All England tournament this past season, I sat in the twelfth row along the sideline and started my stopwatch on the third rally of the first game. Forty-two seconds. Not a thunderous smash that shook the arena, not a diving save that entered the history books, just forty-two seconds of quietly exchanged shuttles. The two players covered a combined distance of more than three hundred meters on a court just 13.4 meters long. I have followed professional badminton for nearly a decade across hundreds of tournaments, and I cannot recall the last time I saw a rally end within ten seconds at the world-class level.

That was not a coincidence of one match. It was a signal of an entire season. And if you pay attention, it is also a signal of an entire decade of quiet transformation that few have named: badminton is becoming a sport of the lungs, no longer a sport of the wrists.

Twenty years ago, when I did not yet know how to hold a racket, people taught a nine-year-old child in Japan that badminton was a sport of technique. My father, an amateur player, told me that to win you needed a soft wrist, a feel for the shuttle, and an understanding of rhythm. No one mentioned running. No one said that fifteen years later, the world's top players would run an average of six to seven kilometers per match in singles lasting more than an hour, with acceleration peaks approaching thirty kilometers per hour, and smashes exceeding four hundred kilometers per hour.

Badminton has changed. But the more interesting question is: what has it changed for, and what is the price of that change?

Throughout this regular season, I have recorded every men's and women's singles match at the Super 1000 and Super 750 tournaments, cross-referencing with data from the Badminton World Federation (BWF) and my own notes from the past four years. What I found did not lie in the hardest smashes, but in the time between two smashes. That is where matches are truly decided, and it is also where this sport is being rewritten from within.

Context: when the badminton court becomes a running track

To understand why that forty-two-second rally matters, we must place it in the context of an entire competition system that has changed in nature over fifteen years. The BWF World Tour is currently divided into levels from Super 1000 down to Super 100, with Super 1000 being the highest tier comprising the All England, China Open, Indonesia Open, and Malaysia Open. At this level, the schedule is dense, spanning Asia and Europe, and the requirement to qualify or accumulate ranking points forces players onto the court almost year-round.

The first change came from the scoring system. Since the rally-point system was adopted in 2026, every rally is worth equally, and the concept of earning the right to serve no longer exists. This means no rally is a "free" rally. Every shot, whether at 0-0 or 19-19, demands the same focus and stamina. The consequence is that actual playing time on court has increased significantly, while the rest interval between rallies is limited by the rules.

The second change came from materials. Modern shuttles are made from natural feathers or synthetic materials with higher aerodynamic capability, more stable flight paths, and most importantly, slower fall speed through the air. This causes rallies to last longer because the shuttle flies longer, giving opponents more time to react. Combined with courts where temperature and humidity are strictly controlled at major tournaments, the playing environment becomes ideal for long rallies.

The third change, and perhaps the most important, came from the players themselves. The current generation of players is trained more systematically in physical conditioning than the previous generation. They have personal strength coaches, specialized nutrition plans, and scientific recovery programs. This creates a paradox: when everyone is fitter, physical advantage is no longer an absolute advantage, but becomes a minimum condition for survival. Those without enough stamina are eliminated, but those with only stamina cannot win.

In that context, that forty-two-second rally is no longer the exception. It becomes the standard. And when the standard changes, the way of playing must change accordingly.

Core analysis: anatomy of a long rally

Over the past three seasons, the data I have personally recorded shows that the average length of each rally from the quarterfinals onward has increased from about 8.5 seconds to nearly 11 seconds, while the number of rallies exceeding 30 seconds in a single match has nearly doubled. This number may sound small, but when multiplied by hundreds of rallies in a match, it creates an enormous difference in total volume of movement.

Let us do a simple calculation. A men's singles match of three games at the Super 1000 level lasts on average 70 to 90 minutes, with about 150 to 200 rallies. If each rally lasts 2.5 seconds longer than ten years ago, the actual playing time increases by 6 to 8 minutes. But that is not the whole story. More important is the intensity of those rallies. A long rally does not only demand endurance, but also the ability to maintain technical focus in a state of fatigue.

I have spent many evenings rewatching footage of top players' matches, and what I realized is that technique does not disappear when tired. Technique gets compressed. Shots become shorter, safer, less risky. Players begin to play not to lose first, and then to win. And in that period, whoever retains the ability to accelerate suddenly will be the winner.

That is why I call this a sport of the lungs. Not because the wrist is no longer important, but because the wrist can only function when the lungs have enough oxygen to fuel it.

Cross-disciplinary translation: when badminton learns to run a marathon

Athletics teaches us about the finish line, football teaches us about the journey, and esports teaches us both compressed into a single combat exchange. I still keep that sentence in my notebook, and this season it is especially true of badminton.

If you have ever watched a match by top players such as Viktor Axelsen or An Se-young, you will notice something strange: they move more like middle-distance runners than traditional racket players. Their steps are short, rhythmic, and calculated to save maximum energy. They do not run to the shuttle; they adjust their bodies so the shuttle comes to them. That is a completely different philosophy from the previous generation, the generation of smashes and dives.

When I compared the acceleration path of a football full-back with the movement path of a badminton player in the corner, I realized both follow the same principle: reduce unnecessary distance, accelerate at the right moment, and most importantly, know when not to run. In modern football, top teams use substitutions to maintain pressing intensity throughout the match. In badminton, there is no substitution, meaning players must manage their own energy over 90 minutes. This is a much harder problem.

From this angle, I see badminton as closer to marathon than to other combat sports. A marathon runner does not win by running fastest in every kilometer, but by distributing energy most intelligently. A badminton player is the same. They do not win by smashing hardest in every rally, but by maintaining the highest technical quality in the decisive rallies.

Meanwhile, esports teaches us a different lesson: in brief moments, fast and accurate decisions matter more than powerful actions. A combat exchange in League of Legends lasts a few seconds but can decide an entire match. In badminton, a 30-second rally is the same. It is not only a test of stamina, but a test of decision-making ability in a state of depleted energy.

I once spoke with a former professional player who retired after a knee injury. He told me the hardest thing is not smashing when fresh, but deciding which smash to hit when tired. At the seventieth minute of a match, when the legs no longer obey, the brain begins to make wrong choices. That is when the match truly begins. And that is when the best-conditioned players win, not because they are stronger, but because they tire later.

Specialization and the trap of diversity

Here I want to pause for a moment to discuss a paradox I have observed over many years in this profession. As badminton becomes more demanding physically, the natural response of training academies is early specialization. Children aged eight and nine are placed in specialized training centers, practicing six days a week, playing only badminton and nothing else. The logic is clear: to compete at the highest level, you must accumulate enough training hours, and the only way to do that is to start early and focus absolutely.

But I am not sure that is the right path.

Over the past four years, I have followed the development of many young players in different countries, from Japan, Korea, Indonesia, Thailand to Denmark. What I found is that players with a multi-sport foundation in childhood tend to have longer career longevity and better tactical adaptability than those who specialize early. They are not only better at badminton, they understand sport better. They know how to read a match like a person reading sheet music, not just like a person playing an instrument from a pre-written score.

This may sound counterintuitive, but it has a scientific basis. Studies on athlete development show that exposure to multiple sports during the developmental period helps build a richer movement foundation, reduces the risk of repetitive injury, and increases creativity in problem-solving on court. In badminton, where every rally is a new tactical problem, this creativity is worth no less than stamina.

At 17 I thought I knew everything about football. At 25 I know I am only good at listening. I once wrote confidently analytical pieces arguing that specialization is the only path to success in elite sport. Now, looking back, I see I overlooked something important: the greatest athletes I have ever studied all share one thing—they played multiple sports as children. Roger Federer played football and basketball. Kylian Mbappé played basketball. Viktor Axelsen played handball and swam. Not a coincidence.

So what is really happening to badminton this season?

If I had to sum it up in one sentence, I would say this: badminton is undergoing a restructuring of energy distribution across technical zones, and whoever understands their body best will go furthest.

Previously, winning and losing at the highest level was decided by who had the harder smash, who could dive to save better, who had the more flexible wrist. It was a sport of moments. Today, winning and losing is decided by who can maintain high technical quality for longer, who can recover faster between rallies, and who can make accurate decisions when tired. It is a sport of processes.

This shift has important implications for how we evaluate players. The hardest smash index, long a prestigious metric for many years, is gradually losing its decisiveness. A player who smashes at 420 kilometers per hour but cannot sustain intensity in the third game will lose to a player who smashes at 380 kilometers per hour but knows how to distribute energy. This is something traditional analysts often overlook, because they focus on the peak of the rally rather than the whole picture.

I re-checked my data this season and found a clear trend: in matches lasting three games, the win rate of players with better physical indices (measured by distance covered and number of rallies over 25 seconds) was significantly higher than that of players with better smash indices. This is not a denial of technique. It is an acknowledgment that technique and stamina are no longer two separate categories. They are one.

Counterintuitive view: specialization may be a trap

Now comes the part where I want to challenge myself. For many years, I was a strong advocate of specialization. I believed that to reach world class, you must focus on a single sport, must sacrifice other things. But this season's data forces me to revisit the question.

If badminton becomes increasingly demanding physically, early specialization leads to higher injury risk, shorter career longevity, and poorer tactical adaptability, is that really the optimal path? Or are we optimizing for the wrong goal? Are we training the best players at 15, or the best players at 25?

I think the answer lies in balance, and that is what leading badminton nations are gradually realizing. Japan, my homeland, is famous for its disciplined training system, but in recent years it has begun encouraging young players to play more sports. Korea, where I live, is also changing in a similar direction after the success of the An Se-young generation. In Southeast Asia, where badminton is part of the culture, players often grow up in an environment of naturally playing multiple sports, and that may be an advantage we have not properly valued.

Here I want to bring in a third reference point. Emerging badminton nations in Southeast Asia, especially Thailand and Vietnam, are showing a different development model. Instead of concentrating on a few large training centers, they create a distributed ecosystem where young players are exposed to multiple sports before specializing. The result? Players with more diverse movement foundations, better adaptability, and most importantly, fewer injuries during development. This is a model that traditional badminton nations could learn from, rather than imposing their own model on others.

The irony is that while badminton becomes more physically demanding, the sport needs players who are more versatile in thinking. They need to read matches, manage emotions, and adapt to different playing conditions. These skills cannot be trained in a specialized center. They are built through experience, through playing multiple sports, through losing many times and learning to get up. And we cannot train that if we lock young players in an arena from the age of eight.

Lessons from empty arenas and numbers that do not lie

I want to return to a theme I always reflect on: the empty space in the stands. An empty arena does not stop the shuttle from flying, it just flies through another dimension. During the 2026 pandemic, when arenas worldwide closed, I spent many months analyzing data from spectator-free tournaments. What I found was surprising: home advantage dropped significantly, but the average technical quality of matches increased. When there is no crowd roar, players focus more, calculate more, and are less swept up by emotion.

What does this mean for the current season? I think it reminds us that badminton, in its deepest essence, is a game of focus and control, not of explosive emotion. The crowd, the cheers, the tension of a big match—all are external variables. The internal variable, the one that decides victory and defeat, is the ability to stay clear-headed when body and mind both want to give up.

But I do not want to romanticize this silence. Behind every forty-two-second rally is a measurable number: distance covered, heart rate, blood lactate concentration. These numbers do not care about emotion. They say only one thing: badminton has become a sport where the human body must operate near its physiological limits for nearly an hour. And that physiological limit is finite.

I once watched a player collapse after a long rally, not from injury, but because his body simply could not continue. In that moment, his coach ran onto the court with a bottle of water and a towel. No tactical advice. No strategy. Only a body that needed rescuing. That was when I realized we are watching a different sport from the one I grew up with.

The gray zone between data and intuition

There is one thing statistics can never capture: the moment a player decides not to smash. In a long rally, when the opportunity appears, some players choose to smash and lose; others choose to push safely and keep waiting. That decision is not in any data model. It is in instinct, in experience, and in something I can only call intellectual stubbornness.

I spent many weeks this season analyzing decisions at crucial scores, especially from 18-18 onward. What I found is that top players tend to choose longer, safer rallies at decisive moments, while younger, less experienced players tend to accelerate and smash more. The result? The patient player does not always win, but in the long run, they win more. This is a lesson data cannot teach, only defeat can.

That is also why I do not believe in absolute conclusions. Badminton is not an equation with a single solution. It is a series of decisions, each opening a new branch, and no one can know which branch is right until the match ends. People tell me I break conventions, but I am only searching for a common language between different arenas.

Echoes from smaller tournaments

There is a paradox I want to raise, and it concerns how we follow badminton. We focus on Super 1000 tournaments, on matches of top players, on numbers in the world rankings. But the real signals of change in this sport often appear at smaller tournaments, where few are watching.

This season, I spent time following Super 300 and Super 100 events, and I noticed something interesting: young players are playing differently from the previous generation. They move less, are more patient, and seem to understand energy management better. This may be the result of better data access, or it may be the result of a shift in coaching philosophy. Whatever the cause, the result is clear: the new generation of players is being trained to play a different sport from the one the previous generation played.

This has important implications for nations trying to build a strong badminton program. If you only look at major tournaments, you see a static picture, where top players dominate. But if you look at smaller tournaments, you see a dynamic picture, where new ideas are being tested, where new ways of playing are being developed. And that is where the future of this sport is being written.

On the Olympics and the limits of fairness

The Olympics is where people cry over a thousandth of a second, and call it fair. I have thought about this sentence a lot while following the current Olympic cycle. In badminton, a thousandth of a second can be the distance between a smash landing in and a smash landing out. But the fairness of sport does not lie in that thousandth of a second. It lies in the preparation process behind it: thousands of hours of training, hundreds of matches, and countless small decisions no one sees.

This season, as the Olympic cycle approaches, I have noticed increasing pressure on players. Ranking points become more important, tournaments become more tense, and every defeat carries the weight of a four-year cycle. This is when the question of stamina becomes especially important. When there is less time to recover between tournaments, players with a better physical foundation gain a significant advantage.

But I also want to talk about the downside of this pressure. When players are forced to compete too much to accumulate points, they have less time to recover and train. The result is that technical quality may decline, and injury risk increases. This is a systemic problem, and it cannot be solved merely by asking players to train harder.

On injuries and the price of return

I want to dedicate a portion of this article to something I consider important but often overlooked: injuries. This season, I have watched too many players leave the court due to injury. Knees, ankles, shoulders, backs. Each injury is a story, and behind each injury is a decision.

Demanding a player prove themselves in their return match is cruel. I have seen this too many times: a player returns from injury, and is immediately expected to play as if they never rested. If they lose, people say they are finished. If they win, people say they are back. No one talks about the recovery process, about sleepless nights from pain, about hours-long physiotherapy sessions.

This pressure harms players not only mentally but also increases the risk of re-injury. When a player is forced to play at high intensity too early, their body is not ready, and the next injury is only a matter of time. This is an issue I believe both the BWF and tournaments need to consider more seriously.

In this context, I appreciate the efforts of some nations to protect their players. They allow longer rest after injury, they do not place heavy emphasis on results in the first tournaments after return, and they focus on building long-term physical foundations rather than short-term results. This is an approach I hope will spread.

On the fan community and the writer's responsibility

Finally, I want to talk about us, those who follow and write about this sport. What responsibility do we have to badminton?

I believe we have a responsibility not only to report but also to educate. Not only to praise victories but also to explain defeats. Not only to glorify stars but also to honor the quiet contributors: strength coaches, physiotherapists, data analysts. These people do not appear on television, but they are an indispensable part of every victory.

I also believe we have a responsibility to challenge misconceptions about this sport. Like the notion that badminton is a light sport, requiring just a few swings to play. Or the notion that female players cannot compete at the highest level. Or the notion that tactics are only for team sports. Each of these misconceptions contributes to limiting the development of the sport.

I was born in Japan, work in Korea, and write in Vietnamese for a fan community in Southeast Asia. I have a unique position to observe this sport from multiple angles. But that position is only valuable if I use it to expand understanding, not to impose a single viewpoint. Badminton in Japan is different from badminton in Korea. Badminton in Korea is different from badminton in Indonesia. Badminton in Indonesia is different from badminton in Vietnam. The beauty of this sport lies in that diversity, not in uniformity.

An open ending

This regular season, while following hundreds of matches worldwide, I realized that badminton is at a turning point. Not a turning point in rules or equipment, but a turning point in the nature of the sport. Badminton is becoming a sport of lungs, of patience, of endurance. This may please those who love persistence, but it may also disappoint those who love explosion and creativity.

The future of badminton will depend on our ability to balance these two things. To preserve the drama of decisive rallies while honoring the value of long rallies. To encourage technical creativity while acknowledging the importance of stamina. And above all, to remember that behind every number, every data point, every tactic, is a human being trying to overcome their own limits.

I will continue to watch, continue to record, and continue to ask questions. Because badminton, like every sport, never stops changing. And the task of the writer is not to record what happened, but to understand what is happening, and perhaps, to guess what is about to happen. That requires the humility to admit we do not know everything, and the curiosity to keep learning. When the next season begins, I will again sit in the twelfth row, start my stopwatch, and wait for the next rally. Because the shuttle never stops flying, and the story never ends.