Vietnamese Swimming: The Data Gap Behind Every Lane

5:47 a.m. The pool surface is flat as a page nobody has written on. A swimmer stands on the starting block, draws in a breath long enough to stretch the ribcage, and lets the body fall into the water. The splash is not loud — just a neat, almost polite "plop." But stand close enough and you hear something else: breath compressed in the throat, the hand fanning the water as steady as a sewing machine that never tires. That is the sound I have learned to listen for across fourteen years in this trade. I stand at the edge of that pool, and the first question I want to ask is not "how many seconds did you swim?" It is: "what did you feel at the 150th metre?" Almost no one can answer. Not because they do not want to speak, but because no one has ever asked them that way — and because there is no data for them to look back at. There are races that are not measured by the clock, but by the silence between two breaths. That is why I began to notice something few people in Vietnamese sport are willing to look at straight on: the data gap. We talk endlessly about results, about medals, about the miracles at the SEA Games. But when someone asks a simple question — how many strokes per minute does this swimmer take, how long is the glide between strokes, how much slower is the final 50 metres than the first — the answer is usually a silence. That silence is the subject of this piece. Not because I want to criticise. But because I believe Vietnamese swimming stands at a threshold, and the ticket through that threshold is not more money poured into pools. It is learning how to measure ourselves. Nguyễn Thị Ánh Viên was the finest image of Vietnamese swimming for a decade. She was one of the rare Southeast Asian athletes able to compete at continental level, a medallist at the ASIAD and a multiple Olympian. Yet across the height of her career, the public data available to Vietnamese fans was almost entirely one thing: the finishing time. You cannot find — systematically — her 50-metre splits in a major final. You do not know whether she changed her stroke count between laps. You do not know how she entered the return lap, how she handled the turn, how she adjusted her breathing over the final 25 metres. All that remains, for the fans, is a number on the scoreboard and a few short lines of news. What does that mean? It means we loved an athlete without understanding how she won. And a sport that only loves without understanding is a sport that struggles to improve. Nguyễn Huy Hoàng is a more recent example. The young man from Quảng Bình drew attention when he qualified for the Olympic Games in a distance event, becoming one of the rare Vietnamese swimmers to step onto the world stage. But when I look at how the media covers him, I see a familiar pattern: the story always revolves around willpower, around circumstances, around "overcoming hardship." Rarely does it revolve around how he distributed his energy across laps, or how his physiology compares with rivals in the same event. I am not saying willpower does not matter. Willpower matters. But willpower is the tip of the iceberg. The submerged mass is data — and that mass is missing. Picture an analysis session at a national swimming team in a powerhouse nation. After every training session, every swimmer has their own data: split times, stroke rate, breathing cycles per lap, average thrust measured through underwater gates, heart-rate recovery after each set. In some places, sensors are attached to the shoulder and wrist to measure the thrust and stability of every stroke path. Everything feeds a database, to compare today with last week, to catch a 0.2-second decline before it becomes an injury, to know that a swimmer going faster is not stronger — she is simply taking fewer strokes over the same distance. In Vietnam, that level of detail is largely absent. I have spoken with many coaches. One said it plainly: "We still mostly rely on feel and experience." Not because they lack passion. But because they lack tools, processes, people and time. What is the consequence? A swimmer can train for ten years with the same small technical flaw and no one catches it, because no one looks back at data systematically. A talent can be burned out by an overloaded training programme, because there is no recovery data to warn anyone in time. And when we step onto the continental stage, we often lose not because we lack natural speed, but because we lack knowledge of ourselves. Swimming is one of the most silent sports. Unlike football, where you can count pressing actions or distance covered, swimming happens underwater, hidden from the naked eye. Spectators see shoulders, heads, trails of water. But beneath the surface lies a world only data can illuminate. In the silence, an athlete's heart beats louder than any roar of the crowd. I once sat through a replayed lap of a young Vietnamese swimmer, shot from an underwater angle. The coach pointed out one detail: at the 30th metre of the lane, she began dropping her left shoulder slightly earlier than usual. So small a detail that at normal speed you would never see it. But that was the beginning of an imbalance, and the beginning of the shoulder injury she suffered a few months later. That story stayed with me. If that team had a routine of recording and comparing data regularly, might she have been warned earlier? Perhaps. Not certainly. But at least they would have had the chance to know. That is what I want to call the "data gap" — not a simple shortage of information, but the absence of a habit: the habit of looking back, measuring, and questioning what we have already done. There is another angle to this story that I rarely see discussed: the structure of the competition calendar. Vietnamese swimming orbits the SEA Games as an emotional anchor. Every two years, the whole sporting system pours itself into a regional gathering, and swimming is no exception. SEA Games results become almost the only yardstick — and that yardstick shapes both training and coverage. The problem is that the SEA Games, in terms of swimming standard, is not a stage that can predict success at the Olympics or the ASIAD. A SEA Games medal is deeply honourable — it is the product of real effort. But if we make it the only destination, we are designing an entire training cycle to excel at one stage, then standing stunned when we lose at a higher one. Swimming powers do not think that way. They think in four-year Olympic cycles, and the SEA Games — if it features at all — is only a stopover for a fitness check. Their SEA Games data is not used for celebration, but for comparison against Olympic standards. The same number, read two entirely different ways. This is not a dismissal of emotion. Emotion is what makes sport. But emotion and analysis do not exclude each other. We can cry and turn the data page at the same time. The problem is that we have not turned it. On rules and governance, Vietnamese swimming sits inside the same system as everyone else, with ever-tighter requirements on anti-doping and competition conditions. This is an area where the data gap can cause damage far beyond winning and losing. At international level, an athlete can inadvertently commit a doping violation by taking a common cold medicine containing a prohibited substance without checking carefully. Teams with clear procedures keep a database of every medication their athletes are permitted to take, with monitoring records. They know exactly what their athlete took, when, and who prescribed it. In Vietnam, such procedures exist, but unevenly. Some teams do it very well. Others still rely on memory and trust. And this is a domain where one small hole can destroy an entire career. What is worth reflecting on is this: the data gap is not only a story of performance. It is a story of safety, of fairness, and sometimes of a person's dignity. When it comes to athlete careers, I think of curves that are never drawn. A swimmer's window is narrow. The peak usually arrives between twenty and twenty-five, extended by luck and by good management. Then comes the decline — not sudden, but gradual, like water receding in a pool. In developed sporting nations, they manage that curve with data. They know which year is a breakthrough year, which is an accumulation year, when to move from sprint to distance, when to reduce volume to preserve. They also know when to prepare a second path for the athlete — study, coaching, another trade — so that when the person leaves the pool, they do not fall into a void. In Vietnam, we usually only realise an athlete's time is up when it is already up. And then the story often ends with a short news line, with nothing to look back at, because there is almost nothing to look back at. A sport without data on the careers of its athletes will struggle to tell a child: "If you follow this path, you will have a future." Because we do not know what that future looks like. There is one thing I want to say clearly, and perhaps this is the most counter-intuitive point in this piece. Many people believe the biggest problem in Vietnamese swimming is facilities, money, pools. I do not deny that. But from my years of watching, what holds us back most is not a shortage of money — it is the absence of a culture of measurement. This sounds dry, but it is decisive. A beautiful pool without data is just a beautiful pool. An old pool with good data can produce a champion. The history of world sport is full of humble training centres that produced great athletes, precisely because there people measured, analysed, and never stopped asking questions. Our problem is that we love feeling more than numbers. We prefer the story of "overcoming hardship" to the story of "adjusting technique." And that, at some point, becomes a collective habit — a habit that makes us comfortable with what we do not know. I have seen signs of change. More young coaches are willing to learn how to use cameras, analysis software, connected sports watches. More parents are asking better questions about their children. But those pieces remain scattered, not yet a system. And this is where journalism can play a role. Not to blame anyone, but to ask questions no one previously asked. So that when an athlete finishes, we do not simply report "she won." We also ask: "how did she win, and what does that say about the road ahead?" Huyền crossed the finish line, and I crossed the boundary of my profession. I wrote that line years ago, watching a female track athlete finish at a SEA Games. That day I realised the moment an athlete touches the line is also the moment the real story begins. For swimming, the moment a hand touches the wall is the same. Zoom out, and the data gap is not only a story of elite swimming. It drags a whole chain behind it. Recreational swimming in Vietnam is growing fast. More and more children are sent to learn to swim, not only to compete but to know how to swim — a vital life skill in a country of rivers and water. Swimming schools are sprouting everywhere. This is a good sign. But when a market grows fast, quality rarely keeps pace. Are the instructors qualified? Is the curriculum structured? How long before a child can truly swim — not just a few metres in a safe pool, but far enough to save themselves? Without data, without standards, the answer depends on the promises of each centre. When an industry has no measurement standard, it is governed by marketing rather than quality. And in a field touching children's safety, that is a worrying thing. Then there is equipment. The market for swimwear, goggles, caps, core trainers and connected swim watches is all growing. But Vietnamese consumers have almost no independent source of information to know which product is genuinely good. Everything rests on advertising. That is another data gap, and it sits right inside people's wallets. Finally, the rights and media market. International swimming events are commanding ever-higher rights fees, but Vietnamese audience interest in swimming tends to flare and fade with the SEA Games and Olympic cycles. If we watch swimming only once every two years, this market will remain a seasonal market forever — and no one invests seriously in a seasonal market. The circle closes: no data means no stories, no stories means no enduring interest, no interest means no investment, and no investment pushes us back into the old habit. So where to begin? I do not believe in grand solutions that sound lovely and no one implements. I believe in small, concrete steps that can start tomorrow. A coach can begin recording a pupil's splits after every session. No expensive equipment needed. Just a notebook and a stopwatch. A week later, that person has data to compare. A month later, that person has a curve. A club can begin filming its sessions and reviewing them. No need for a beautiful camera angle. Just a phone on a fixed stand. Watching once a week is enough to catch what the naked eye misses. A journalist — like me — can begin asking different questions. Not "are you happy?", but "which split was hardest?" Not "what do you think of your rivals?", but "where did you change tactics?" Those questions, over time, will change how an entire sport sees itself. And a sport can begin to treat data not as a luxury of the powers, but as a basic language — a language that, if we cannot speak it, will leave us forever spectators of a story told by others. I return to the image of that morning. The young swimmer stands at the pool edge, breathing evenly. She finishes her last lap, climbs out, and asks her coach: "Coach, what was my time today?" The coach looks at the watch and reads a number. She nods, then walks toward her towel. Just one number. No splits, no comparison, no follow-up question. A number is born, read aloud, then disappears — like a drop of water falling into a pool and dissolving into it. I stand there, thinking of all the numbers that have vanished this way over the years of Vietnamese swimming. Each number is a fragment of an athlete's memory, a lesson not yet learned, a question not yet asked. We are not short of effort. We are not short of passion. We are only short of the habit of stopping and writing things down. The clock stops, the story begins. But for the story to truly begin, someone must be willing to write it down — not with emotion, but with numbers, with splits, with patient questions. I believe Vietnamese swimming has enough material to become a larger story than this. But that story will not write itself. It will have to be measured, recorded, and truthfully retold. And perhaps, after everything, the truest question remains the one I have never stopped carrying each time I stand by a pool: not how fast someone swims, but how deeply someone understands themselves — before the clock can stop.