Five Data Traps Distorting Vietnamese Athletics

The clip runs nineteen seconds. The frame shakes, wind buffets the phone microphone, and at the thirteenth second a male voice shouts: "Ten-nine." The runner is an eighteen-year-old from Quang Nam, I assume, because the message attached to the clip contains exactly one sentence: "Can you tell me if I can make the SEA Games, sir?" No meet name, no stadium, no wind gauge, no photo of the finish line.

I have received hundreds of messages like that. Early in my career I answered every one. Now I answer more slowly, and I usually open with a different question: "Which way was the wind blowing that day?"

Most senders do not know. That is the starting point of a much larger problem than one fast boy from Quang Nam.

Rich in numbers, poor in data

Every weekend in Vietnam, dozens of road races and grassroots track meets take place. Phones shoot sixty frames per second. GPS watches are cheap. Running-form apps are everywhere. Looking at the volume of information published, one could easily believe Vietnamese athletics is drowning in data.

The opposite is true. Proper measurement infrastructure — calibrated wind gauges, photo-finish cameras, electronic timing systems, distance-measuring equipment — appears almost exclusively at national championships and a handful of international events staged on home soil. The rest of the competitive system, from provincial meets down to youth events, runs on a hand stopwatch and faith.

In 2026, I skipped the medal ceremony at a marathon in Da Nang to follow a twenty-three-year-old cross-country runner back to Lien Chieu district. He finished ninth, with no medal. What I brought home was not a results table but a training diary more than eighteen hundred pages thick, kept for five years, one line a day, recording the feel of his legs, the weather, and the number of laps he ran on the sand. That diary held something no results sheet can hold: a curve.

Meanwhile, Vietnamese athletics at its highest level is marked by fairly clear milestones. At the 31st SEA Games, held at My Dinh Stadium in 2026, Nguyen Thi Oanh won three individual gold medals on three consecutive competition days, in the 1500m, 5000m and 3000m steeplechase. At the 2026 Asian Games in Jakarta, Bui Thi Thu Thao won long jump gold with 6.55m. Vietnamese athletics still has no Olympic medal.

The gap between those two worlds — between a continental medal and a hand stopwatch at a district stadium — is where every misjudgement begins. I call them the five traps.

Trap one: wind and altitude

World Athletics technical rules are explicit: in the 100m, 200m, 100m hurdles, 110m hurdles, long jump and triple jump, a mark is only recognised when the wind gauge is correctly positioned and wind speed does not exceed +2.0 m/s. For the 100m, the gauge must sit fifty metres from the finish line. It is a small technical detail, and it changes the meaning of nearly every results table.

A 2.0 m/s tailwind can make a 100m sprinter roughly one tenth of a second faster. Over 200m, that assistance can reach two tenths. A 10.90 run into a +3.5 m/s tailwind is therefore not equivalent to a 10.90 run in still air, and should never be used to place an athlete in a contender bracket.

Based on my experience covering domestic track meets, the number of events with a properly functioning wind gauge is worryingly small. Some have the equipment but never publish the readings. Others publish afterwards, once the result has already spread through the media.

Altitude is the second variable, and it draws far less attention. Vietnamese national squads have spent years training at highland locations such as Kunming, where thinner air reduces drag considerably. A sprinter or jumper can record a personal best there, then return to My Dinh and run three tenths slower. That does not signal a loss of form; it signals an environment. And the environment should be noted before anyone draws a conclusion.

Trap two: the equipment dividend is never deducted

From the late 2010s, shoes with carbon plates and ultralight foam appeared and rapidly reshaped the global distance-running landscape. World Athletics had to issue regulations capping sole thickness for competition shoes. Independent studies at the time indicated carbon plates could improve distance-running performance by roughly two to four percent.

Two percent sounds small. But over a 5000m run of about sixteen minutes, two percent is more than nineteen seconds. Over a marathon, four percent is more than five minutes. That is the difference between an Olympic qualifying place and staying home.

Tracks are the same. Newer generations of synthetic surfaces have cushioning structures and rebound properties fundamentally different from tracks laid two decades ago. An athlete who runs half a second faster than a predecessor over 400m has not necessarily run better; part of that gap may sit under the spikes.

This leads to the consequence I consider most serious in any historical comparison: if the equipment dividend is not deducted, every all-time ranking by time is distorted, and every conclusion drawn from it is distorted with it.

Trap three: small-sample highlights

One good performance does not reveal a level. That is the sentence I have had to rewrite for readers more often than any other.

A sprinter who runs 10.70 in the 100m today could have done so for three different reasons: he genuinely is at that level; the wind that day was strong; or he ran a single round and never went through heats and semi-finals. Three reasons, three entirely different forecasts.

My approach is simple. I collect every result of the season, take the best and the worst, and look at the spread. Over 100m, an athlete with a seasonal spread of about one tenth of a second has technical control. A half-second spread belongs to someone still running on feel.

The minimum threshold before I will write a single sentence about potential is three competitions in one season, same event, comparable conditions. Below that, I call it reference data, not conclusion data.

Trap four: unratified training marks

Back to the nineteen-second clip.

There is an error margin few people outside athletics consider: the gap between hand timing and electronic timing. When a timer reacts to the visual of a runner crossing the line, accumulated error can be far larger than that of a photo-finish system. That is why competition rules require hand-timed results to be rounded up to the nearest tenth of a second before comparison, and in many specific cases hand times are not eligible for record ratification at all.

In that clip, beyond the manual timing error, almost everything else is missing: no wind gauge, no finish-line camera, no opponents on the same track, no shoe check. And most importantly, no verification beyond the group holding the phone.

Training marks have internal value. They let a coach compare his own athlete across weeks. They carry no external value, and should never become a headline.

Trap five: missing split data

This is the trap I consider the most costly professionally, and the least discussed.

A final result is a point. Splits are a line. Only a line tells you where an athlete is going.

In the 400m, the opening 200m split decides almost the entire story. Two athletes who both finish in 47.2 could be completely different athletes: one goes out in 21.3 and collapses, another goes out in 22.6 and accelerates home. The first has potential over 800m. The second has potential in the 400m hurdles. Looking only at 47.2, a coaching staff cannot tell them apart.

In the 800m, the opening 400m split sorts athletes into two groups: those running their own rhythm and those running the opponent's. The second group tends to win heats and lose finals.

In the 100m, the split at twenty metres shows acceleration, the split from forty to sixty metres shows top speed, and the closing segment shows maintenance. Those three indices predict a young athlete's future far more accurately than a finishing time.

In relays, splits matter even more. A 4x100m team's time depends on where each runner is placed, on the run-up distance inside the exchange zone, and on the timing of the baton pass. A team with the four fastest 100m runners is not necessarily the fastest team.

Vietnamese athletics publishes almost no splits at domestic meets. There is no automatic intermediate timing system, and no habit of recording by hand. The result is that we judge athletes by a point, when the nature of running is a line.

The contrarian angle: the problem is not technology

When I lay out the arguments above, I usually get a familiar response: Vietnamese athletics lacks technology, lacks money, lacks equipment.

I do not believe that is the root cause.

Lack of equipment is a money problem, and money can solve it. A calibrated wind gauge is not so expensive that a provincial federation cannot equip its own championship. A mid-range finish-line camera is the same. Annual operating costs are no greater than the cost of renting a stadium.

What is genuinely missing is a habit: asking "measured how" before asking "how fast". A sport with a culture of verification automatically demands wind readings, splits, shoe specifications, and the name of the timing official. A sport without that habit will keep producing records that cannot be reproduced and talents that cannot be verified.

More dangerously, hasty digitisation can make things worse. When everyone owns a measuring device, everyone trusts the number. A GPS watch that drifts a few metres per lap, a running app that adds a few percent to distance, a heart-rate sensor that reads off-standard — all of it creates an illusion of precision. An illusion of precision is more dangerous than ignorance, because it does not incriminate itself.

My worry is not the eighteen-year-olds sending clips. My worry is that the adults among us will use those numbers to make decisions.

Conclusion

A record is only a shadow; the person is the track.

If next season three more domestic track meets publish all three things — wind speed, intermediate splits, and shoe models — I will believe we are moving forward. What I want is not a new national record. What I want is a results sheet with no blank cells.

There are athletes who never reach the finish line, yet keep running in my memory. Most of them were never measured by anything decent.