Vietnamese Swimming and the Data Gap Behind Every Touch of the Wall

On the night of the swimming finals at SEA Games 31 at the Mỹ Đình pool, I sat in the third row of the press area, close enough to hear the water break as eight lanes dove in at once. In lane four, a Vietnamese swimmer turned at the 100-metre mark. On the electronic scoreboard, the number flashed. The stands cheered. But the coach standing beside me did not cheer. He bent down, wrote a short line in his notebook, then told his assistant that the stroke rate was running faster than planned, while the distance per stroke had shortened. I turned to look at him, and I realised something few spectators in the arena noticed: we were reading a race by its finishing time, while the people inside the sport read it by the structure of every segment of water.

I have followed Vietnamese swimming for more than a decade, from junior meets at the Mỹ Đình Aquatic Sports Palace to SEA Games, ASIAD and the Olympics. The longer I follow it, the more I believe the gap between Vietnamese swimming and the rest of the continent is not in the shoulders or the legs, but somewhere few people mention: data.

To understand why, Vietnamese swimming must be placed in its proper cycle. The four-year cycle of aquatic sport is marked by two major milestones, the SEA Games and the ASIAD, with the Olympics at the highest peak. For Vietnam, the SEA Games is home ground in terms of results, where our swimmers regularly win gold. But the moment they step up to the ASIAD, the picture changes colour: the opponents are no longer neighbouring countries, but Japan, China and South Korea — swimming nations with training and data-analysis systems at a world-class level.

Nguyễn Thị Ánh Viên was once the phenomenon of Vietnamese swimming. The girl from Cần Thơ stunned the 2026 SEA Games in Singapore by winning eight gold medals, then went on to dominate the regional lanes for years. She was also one of the Vietnamese swimmers who appeared at the Rio 2026 Olympics and later at Tokyo 2026. But what few noticed is that even at the height of Ánh Viên's career, Vietnamese swimming still lacked a measurement and lane-analysis system of sufficient scope to turn individual results into a lasting foundation.

Nguyễn Huy Hoàng is the next face. In the 1500-metre freestyle, he won a bronze medal at the 2026 ASIAD in Jakarta, and a gold medal at the 2026 SEA Games in the Philippines. Those numbers look beautiful. But behind them lies a bigger problem: when Huy Hoàng swims 1500 metres, how does he distribute his pace across the segments? How does his distance per stroke change as he tires? Is his stroke rate held steady? In many major swimming nations, those questions have ready answers, updated after every training session. In Vietnam, they are usually answered only by feel.

That is when I think back to the structure of an elite swim race. A men's 200-metre freestyle at world level can be split into four 50-metre segments, each with its own job: the opening segment to claim position, the second to hold rhythm, the third to endure pain, the fourth to unleash. A 1500-metre swimmer has to manage nearly thirty turns, each one a chance to accelerate or lose rhythm.

At this level, swimming is no longer purely a matter of strength. The limit of a modern swimmer lies not in the lungs, but in the ability to read oneself in the water. An athlete who knows exactly where they are after every 100 metres will distribute their energy better than one who swims purely on instinct. And to know where they are, they need data.

I once rewatched the footage of a men's 400-metre individual medley final on the continental stage. What caught my attention was not the speed, but the difference in how the swimmers handled the transitions between the four strokes: butterfly, backstroke, breaststroke and freestyle. The winner did not swim the fastest breaststroke leg. He was simply the one who made the fewest mistakes at the turns, where every hundredth of a second is earned by technique rather than strength.

In Vietnam, we have swimmers talented enough to compete in the region. But individual talent does not create a swimming nation. What creates one is a system: a training centre with underwater force-measurement equipment, a team analysing video stroke by stroke, and sessions designed on physiological data rather than the intuition of a coach.

For many years, Vietnamese swimming has relied too heavily on outstanding individuals. Ánh Viên was one such case. Huy Hoàng is another. But when an individual shines without a system to catch the light, that light goes out when the individual retires. This is the problem every small sporting nation faces: producing a star is easy; building a sustainable development pipeline is hard.

The interesting thing is that swimming itself has an advantage when it comes to data. Unlike football, where everything happens in chaos, swimming takes place in a straight lane, with hundreds of measurable points: the time of every 50 metres, stroke rate, distance per stroke, underwater time after the start and after every turn. Swimming is a sport measurable down to the hundredth of a second, yet we let that data slip away. If there is one sport where data can produce a leap forward, it is swimming.

The leading swimming nations operate differently. In the United States, a young swimmer from the age of twelve already has a record tracking results across seasons, and universities recruit on the basis of those records. In Japan, national training centres work with universities to analyse the technique of each stroke. In Australia, aquatic sports science is a genuine industry, with specialists who do one thing: turn video into actionable data.

Vietnam does not yet have that infrastructure. But we have another advantage: a generation of athletes already used to being analysed, and a generation of young coaches willing to learn. The question is how resources are allocated, and whether we treat data analysis as the core of performance or merely as a sideshow.

It is also worth mentioning the rules. In freestyle and butterfly, swimmers may stay underwater for up to 15 metres after the start and after each turn. This is one of the points where dolphin-kick technique becomes paramount, because the underwater phase is usually faster than the surface phase. A swimming nation that wants to compete at continental level must master this detail. But to master it, you need underwater cameras and software to measure underwater time — things that major training centres in Vietnam still lack.

Then there is the question of integrity. Swimming is one of the most heavily doping-tested sports, and every result must stand up to verification procedures. For a developing swimming nation, building a culture of compliance from the junior level is no less important than building results. A medal won without a process behind it is only a brief joy; a solid foundation is the true legacy.

Here, I want to offer a view that differs from the majority. When people talk about Vietnamese swimming, they usually talk about medals: how many golds at the SEA Games, whether the ASIAD can be conquered. Framing the question that way inadvertently turns every athlete into a medal-hunting machine and makes results the only yardstick. But if we look only at medals, we miss the most important thing: whether we are building a swimming nation, or merely manufacturing moments of brilliance.

There is a paradox I have witnessed in the press room. Whenever a Vietnamese swimmer wins a medal, the news spreads fast, but news of a training centre newly equipped with a force-measurement machine is shared by no one. We love the moment, but rarely love the process that creates the moment. And it is that process which will decide where we stand in ten years.

This leads to another blind spot: we tend to compare Vietnamese swimming with Southeast Asian swimming, when the real opponent at the ASIAD is Japan, China and South Korea — swimming nations with a depth of development we have not yet reached. Leading the region does not mean being ready for the continent. To step onto the continental stage, we need more than SEA Games gold; we need a system capable of reproducing success.

Of course, some will say we do not have enough money to do everything. That is partly true. But data analysis does not necessarily require huge investment right away. It begins with small things: recording split times instead of only the total time, filming from two fixed angles at every important training session, and building a database to compare one swimmer with another, one season with another. Those things do not cost much, but they demand a change in mindset: treating data as an asset, not a formality.

I remember a morning in 2026, when international competitions were cancelled and stadiums stood empty. The empty stands of 2026 taught me that sport is never silent; it only changes its voice. Vietnamese swimming is the same: it never stops moving forward, only it moves in ways we are not always subtle enough to notice.

There are races not measured by the clock, but by the silence between two breaths. For Vietnamese swimming, that silence is stretching out just as the whole region has begun to transform. In the silence, an athlete's heart beats louder than any cheer — and this time, perhaps, we need to listen with both data and emotion.