Athletics and How to Read a Mark: Wind, Altitude, Shoes and the Gaps in Data

On August 1, 2026, at the Olympic Stadium in Tokyo, Su Bingtian crossed the line in the men's 100m semifinal in 9.83 seconds. I sat in front of a screen in Saigon, a yellowing notebook in hand, jotting the mark down and circling it three times. But what made me pause was not the nine-point-eight-three. It was the flood of questions that followed: how many metres per second was the wind, was the track faster than usual, how much did the carbon-plated shoes contribute, and how fast was his first sixty metres. An athletics performance, stripped of its context, is nothing but a blur on a results sheet. Across forty-seven years in this trade, I have learned that a reporter's worth lies in asking questions before celebrating, rather than shouting at the sight of a handsome mark. Athletics is the sport where data speaks for the human being, but also the one where data is most easily distorted. An athlete who runs faster than yesterday has not necessarily improved, because yesterday the air was still and today the wind blew at his back just within the legal limit. Someone who jumps farther has not necessarily grown stronger, because the runway at the new stadium may be firmer and springier. At first I thought as simply as most spectators: look at the results table, whoever is ahead is better. The deeper I went, the more I realised that behind every mark lies a chain of technical variables, and a reporter is obliged to read that chain. World Athletics rules state that a sprint performance is only recognised when the assisting wind does not exceed two metres per second. This is a threshold anyone in the trade must know by heart. Beyond two metres per second, the performance is still recorded but no longer counts for ranking or records. Besides wind, the altitude of the venue is another silent variable: above one thousand metres above sea level, thinner air reduces drag, and sprints, long jump and javelin all benefit invisibly. Then there are the shoes. New carbon-plated, foam-cushioned shoes have quietly changed the very notion of a personal best, to the point where analysts must ask: when everyone wears better shoes, are we measuring the human body or the technology? I remember once sitting a whole evening just to cross-check the splits of a four-hundred-metre race. People usually look only at the final time, but over four hundred metres the distribution of speed across the first two hundred and the last two hundred is the real story. An athlete who finishes with a time equal to last year's may still have improved enormously in tactical terms, if their closing segment was markedly faster. This is the kind of information Vietnamese media almost never carries, because it demands time and a granular data set. Without it, every judgement is one-sided. Athletics is also a sport where peaking is planned week by week. An athlete may post a season's best in May and fade in August, or conversely build quietly to explode exactly at the championships. Judging an athlete on a single outing is therefore the sloppiest way to read data. An analyst needs at least the season's top-ten marks, plus the average age of the leading group, to know whether an event is in a phase of individual dominance or entering a generational handover. When the leaders age out together, that signals a gap about to open, and an opportunity for rising athletics nations. There is another auditing tool I regard as the most important in the trade: the year-by-year personal-best curve. If an athlete has improved only a few hundredths of a second each season for years, then suddenly leaps three times that annual gain in one year, that is a signal worth examining closely. I am not saying a leap is cheating. I am saying data has the right to demand an explanation. The World Anti-Doping Agency runs the biological passport, stores test samples for up to ten years, and reallocates medals to later finishers once earlier ones are caught. But when there is no data, silence does not equal innocence. The absence of information is a gap, not yet a certificate. In 2026, while the whole newsroom fixed its eyes on the men's World Cup in Russia, I secretly watched the final of the women's U20 World Cup between Japan and Spain. I was obsessed with how the Japanese girls pressed high, covering 18.7 km per match, with nine ball recoveries in the opponent's third. I filed the piece, and the editor rejected it as off-topic. The article rejected that year is now the scar I cherish most. Not because I enjoy rejection, but because it taught me that correct data can be ignored, yet never erased. The power map of world athletics has been fairly stable for decades. Jamaica and the United States dominate the sprints. Kenya and Ethiopia share the honours over middle and long distances. The United States has formidable depth in jumps and throws. Europe produces throwers of the highest calibre. China has risen through race walking and women's throws. Vietnam's place on that map remains modest, and I always wonder whether we are reading our own true strength correctly. In Southeast Asia, Vietnamese athletics has memorable milestones. SEA Games editions have brought gold medals in running, jumping and walking events. Women such as Nguyen Thi Oanh, Nguyen Thi Huyen and Bui Thi Thu Thao have repeatedly stood on the top step, including medals at continental level. But looking at the gap between domestic performances and the Olympic qualifying standard, we see an uncomfortable distance: very few Vietnamese athletes meet the official standard for the Games, and most must rely on universality places or ranking. I believe the sport's authorities should tell the public this truth, instead of counting medals every Games while forgetting the underlying gap. The entry mechanism for major athletics championships has two paths. The first is achieving the qualifying standard within the required window. The second is accumulating world-ranking points across a series of meets. Alongside that, each country may enter a maximum of three athletes per event. That rule creates a peculiar effect in powerhouse nations: the fourth-place finisher at a brutal national championship may miss the Games despite being on par with the champion. The American trials model is the clearest example, where one race decides everything and even the reigning world champion can come away empty-handed on a bad day. This is a lesson smaller federations should study before rushing to copy it, because without enough depth, a single race can unfairly eliminate the most deserving athlete. National training systems are another variable. Some rely on a school-based model like Jamaica, where school athletics meets are staged as great festivals. Some rely on a centralised national training centre. Some rely on the collegiate system, as in the United States. Each model carries its own price, and none can be transplanted wholesale onto another country. What matters is knowing which model you are in, and measuring it with data rather than belief. Based on my experience watching these competitions, Vietnamese readers are highly attuned to emotion but rarely given the tools to read data. We get excited about a medal, then forget it the next day, because nobody helps us understand where that medal sits on the world map. People see a match; I see destinies passing the ball. I keep that line for myself, but on the track it needs rewriting: people see a mark, I see an entire system racing behind it. There is another trap I see repeating: taking a single flash of brilliance to define an entire career. An athlete may explode on exactly one afternoon, then fail to reproduce it for years. The media still calls them an icon. The data says otherwise: one occasion does not create a class. To know where an athlete truly stands, you must look at a series of marks across many seasons and many different conditions, not a single moment cut out of the flow. The most counter-intuitive thing I want to say in this piece is this: a performance empty of information is not yet a clean performance. In analysis we tend to stay silent about what we do not know, and that silence quietly becomes a form of certification. If an article does not mention doping, readers assume the athlete is clean. If a results table does not record the wind, readers assume the mark is real. Both assumptions are methodologically wrong. I learned from a Canadian female reporter in Tokyo that a reporter's duty is to say clearly what is known and what is not, rather than filling the gaps with inspiration. No less counter-intuitive is the commercial story. A beautiful athletics mark can be used to sell tickets, sell shoes, sell sponsorship deals, while the athlete who produced it receives the smallest share. In many countries, women's national teams receive only a fraction of the sponsorship budget of men's teams, even when their performances on the track are no weaker. I once stayed two extra days in a city just to interview a female athlete through a quarantine window, and what I brought back was not whether she ran fast or slow, but who profits from her sweat. When a federation raises the women's budget only after media pressure, that increase is the result of public opinion, not yet of conscience. That is why every celebratory piece I write must come with a table of sponsorship, payroll and travel costs. The pitch taught me that some lessons are never refused. I do not believe Vietnamese athletics lacks talent. I believe we lack a data system thick enough to see that talent, and lack reporters willing to speak plainly about the gap. A country that wants to go far in the hundred metres cannot rely only on a few outstanding individuals; it needs a development pipeline, a sports-medicine system, a culture of record-keeping from school level. That is quiet work, with no medals, no spotlights. But it is decisive work. I am old now, but every call from them makes me young again. Each time a female athlete phones me to talk about training, about field fees, about a worn-out pair of shoes, I find again a reason to keep sitting here, taking notes, asking questions and auditing every mark. So next time you see an athletics performance appear in your feed, try asking how hard the wind blew, how high the venue was, what was in those shoes, and how the person who produced it is being paid. If the answers are gaps, then that is precisely when our sports journalism still has work to do.