Vietnam U18 and the Physical-Fitness Paradox: 108 km Run, Not One Technical Player Made

In the summer of 2026, inside the commentary booth at the U18 Southeast Asian Championship, I recorded a number I could not get out of my head: the Vietnam U18 team ran a total of 108.4 km in one group-stage match, 6.8 km more than their opponent. They held 58% possession and won 2-0. But when I reopened the tape to count one-touch actions under direct pressure, I counted only 11 across 90 minutes. At the same age level, Japanese academies average 31 per match. I sat alone in that booth, three years after the Guangdong television station terminated my contract at 53, and realised I was watching something larger than a youth-team win.

Youth football and the fitness race

People filter transfer news; I filter the sweat of the market. And across the last four seasons, the sweat of Vietnamese youth football has been flowing in a worrying direction.

V.League 1 has 14 clubs, but only about five academies run a technically serious youth system - Hoang Anh Gia Lai, Ha Noi FC, Viettel, PVF and, to a degree, SHB Da Nang. The rest treat the U18 side as a transit station: move players up fast enough to sell, or strong enough to survive in the lower division. Result pressure in youth competitions pushes coaches into a trap. A fast, strong kid produces immediate results; a technical kid needs three years to mature. In a system that rewards weekend results, the choice is predictable.

Since 2026, I have tracked the physical data of the U18 and U19 national finals by hand-recording from tape - a habit from my time working in Kyiv in 2026, before I had any software. At 62 I still keep that method, because writing by hand forces me to watch every action twice. The average match distance of a Vietnam U18 player rose from 8.9 km in 2026 to 10.7 km in 2026. Sprint actions rose 22%. Line-breaking passes fell. Losses of possession in the final 30 metres rose 19%. That is a very clear pattern, and it is not the product of luck or one special generation.

Fitness can be measured, technique cannot

This is a structural problem. Fitness is an index you can buy; technique is an index you must grow. A U18 coach can ask his players to run more, and that figure shows up in the next morning's report. Nobody measures how many times a 17-year-old scans his shoulder before receiving the ball, or how often he picks the correct foot to open the play when pressed from behind. What cannot be measured is not rewarded. What is not rewarded is not taught.

At the PVF Academy, I once spent three straight days watching a U16 session. The coach devoted 40 minutes to a 4v2 rondo in an 8x8 metre space - the minimum drill for building one-touch reflexes. At a comparable academy in the south, that same session was replaced by interval running and fitness work with the ball. Two seasons later: PVF had three players reach the first team; the other academy had seven players sent out on loan and none who stayed.

The 2026 U19 national finals produced something I had never seen in 12 seasons of tracking: passes longer than 30 metres accounted for 34% of all passes, up from 26% in 2026. Youth teams are playing the way an ageing side plays when it tries to move the ball forward fast - skipping the middle third, where technique and tactical thinking are formed. One U18 coach told me he had to choose between winning youth tournaments and keeping his job. I do not criticise him. I criticise a system that puts him in that position and then calls it development.

Conversion rate is the index I consider most important in youth football. Over the last five seasons, the share of Vietnam U18 players who logged at least 500 minutes in V.League 1 within two years of leaving the youth level hovered around 14%. The equivalent figure for Thailand is 21%, for Japan 38%. The gap is not in innate talent - a line I have heard far too often from young coaches back home. The gap is in what they plant during the three U15-U18 years.

Look at the generation of Nguyen Quang Hai and Nguyen Hoang Duc, players who grew up in academies that valued technique, and the pattern is clear: they were not physically outstanding at 18, yet at 24-27 they still start and still change games. The share of that generation who stayed with the national team vastly exceeds later cohorts selected on running metrics. That is evidence the fitness data will never show you.

One factor matters more to me than fitness: decision-making reflex. When I ran the "Speed and Meta" segment at the Tokyo 2026 Olympics, pitting former hurdler Liu Xiang against League of Legends pro Karsa to compare reflexes, I realised something Vietnamese football has never quantified. Both agreed the elite level is not about physical reflex - trainable down to 0.14 seconds - but about choosing the right action within roughly 0.3 seconds. That is precisely the window a Vietnam U18 player has on the ball before being closed down. If he is only trained to run faster, he gains 0.05 seconds - and spends those 0.05 seconds passing backwards.

Fitness is not the enemy

At this age I no longer run faster, but I know which way the wind blows. And the wind is blowing against the majority view.

The easy line is that Vietnamese youth football has become physicalised and coaches are short-sighted about results. Partly true, but it misses a harsher point: the baseline physical level of Vietnamese players was already low, and raising it over fifteen years was not a mistake - it was a necessary condition. Anyone who has watched a Vietnam U16 side lose the second half to fatigue understands why coaches prioritise fitness. The concern is not running 10.7 km. The concern is running 10.7 km with no technical system running alongside it.

Look to another sport for clarity. In athletics, the biggest regional movement of the decade has been expanding sprint events. Nations race each other for speed. But look at the Philippines' success in the hurdles - it comes from better hurdling technique, not from running faster. Speed is the ticket in. Technique is what puts you on the podium. Vietnamese youth football is buying tickets for as many players as possible and forgetting that only a few of them know what to do once inside.

The pandemic taught me that an empty stand is also a kind of data. When stadiums closed in 2026, I realised crowd noise masks a great many technical decisions. With the stands silent, you hear more clearly what the coach is shouting. And at Vietnam's U18 grounds, the loudest instructions of the past two years have been "run" and "clear it." Not "look" or "keep the ball." I logged that as a qualitative index, and it matches every quantitative figure above.

Another angle belongs on the table: Vietnam's esports organisations, which I have covered for the past three years, face an identical mirror problem. The career span of an esports pro is far shorter than a footballer's, yet the youth development and post-retirement support systems are close to zero. Some organisations simply train players to sell - exactly the model Vietnamese football academies are unwittingly copying. Pushing 17-year-olds into competition so they reach signing age looks very much like pushing U18s into the first team before their technique matures. Both are trades built on easily measured physical indices, and both sell long-term honour for short-term results.

This is not a protest piece. It is an accounting piece. If you calculate the cost of developing a U15 player over seven years, you find that promoting him two years early for a sale price can break even in the short term - but it destroys his market value at 24, when his technique should be at its peak. Fitness can be regained at any time. Individual technique and reading of the game can almost never be re-taught after 20. Every transfer figure is an athlete sprinting, and many of them are sprinting toward a wall.

What to watch

This argument will not be settled by one article or one season. But I have a personal commitment: from this season, I will track and publicly publish the conversion rate of each Vietnam U18 cohort into V.League 1 first-team minutes within two years - with technical indices, not just running distance. Publishing data does not fix a system, but it forces the system to look in the mirror. What Vietnamese football needs is not players who run more, but players who, in the 88th minute of a big match, know exactly what to do when the ball arrives at their feet.