100 Grams and a Judo Career Dropped in the Weigh-In Room

In the weigh-in room, tears are rarely seen. An electronic scale does not know how to cry, and a list of randomly drawn names does not know how to show mercy. But on one competition morning, in the lightest women's judo category, a fighter had to pick up scissors and cut off her own hair, then force herself to vomit to reclaim a few hundred grams — and she still failed.

Jung Su-jin, a South Korean judo athlete in the under-48 kg division, went through exactly that. She had passed the official weigh-in the day before competition. She was mentally prepared to step onto the mat. But on competition day, a random check found her 100 grams over the permitted limit, and under the rules, she was disqualified.

One hundred grams. Lighter than a sip of water. Yet heavy enough to close a journey.

To understand why this story hurts so much, one must know how judo handles weigh-ins. Under International Judo Federation (IJF) rules, athletes must make their weight class at the official weigh-in held the day before competition. But the story does not end there. The IJF also maintains a random weigh-in on competition day itself, with a permitted tolerance of 5% above the prescribed class weight. For the under-48 kg category, that ceiling is 50.4 kg, calculated from 48 kg multiplied by 1.05.

The purpose of this mechanism is protective. It exists to keep athletes safe. In judo and wrestling, athletes often cut weight rapidly by dehydrating — skipping food, skipping water, running in rain gear, sitting in a sauna for hours. The body is pushed to its limit, and after the weigh-in, they rehydrate and step onto the mat in a state of electrolyte imbalance. The 5% tolerance is precisely the buffer that lets an athlete rehydrate safely after weighing in without being deemed in violation.

The list of athletes selected for random checks is finalized about one hour before matches begin, and is communicated through the coaching staff. This detail matters, because it places the entire information burden on the coaching team, with no independent verification channel for the athlete herself.

After years of watching combat sports, I have learned that weighing in is never a mere measurement. It reflects the relationship between athlete and team: who monitors, who decides, who is trusted. When that flow of information breaks, the consequences do not stop at one competition slot.

Based on my experience following these matches, the lightest category is always the harshest. There, the gap between a place on the mat and a defeat is measured in the smallest units — a few hundred grams, a few minutes, a few breaths. Viewers only see a fighter step up, but behind her lies a long chain of austere calculation stretching over weeks.

And this is where everything collapses. Jung Su-jin had passed the official weigh-in. She entered competition day in a normal rehydration state. Then the coaching staff told her — twice — that her name was not on the random check list. She believed it. She ate, she drank, her body returned to its usual rhythm.

Until she had only fifteen minutes left before the deadline. That is when the bad news struck. In that brief window, she did what she could: she cut her hair to shed a few grams, then forced herself to vomit to expel the food and water she had just taken in. Her body could not respond in time. The scale stopped 100 grams over the 50.4 kg limit. She was disqualified.

The root error did not lie in the athlete's condition, but in the broken flow of information between the coaching staff and herself. At the moment of the check, she was not in a dangerously dehydrated state — she was only 100 grams over a fairly generous tolerance. Had she known her name was on the list, she could have tightened her weight early, in a far safer way.

Immediately afterward, the head coach resigned and accepted full responsibility. The Korea Judo Federation is expected to issue a disciplinary decision on October 16. Alongside that, another travel-management controversy emerged: the team missed a connecting flight in Dubai. Two incidents, one pattern — the team's operating system has a structural problem, not an isolated error. The head coach stepping down before the federation ruled shows internal accountability pressure had already risen very high, and was also a way to control damage ahead of a potentially harsher decision.

Outside the arena, the story is often read in the simplest way: an athlete let herself go over weight, and she paid the price. That reading is convenient, but it overlooks something more uncomfortable. The 5% tolerance was designed to protect health, not to trap athletes — meaning the fault here belongs to process, not to integrity. She used no banned substances, committed no competitive fraud. She simply listened to her own team and believed she was safe.

The paradox lies here: a system built to protect athletes from harmful weight-cutting habits became the very thing that pushed her into the dangerous behavior it sought to prevent — cutting hair, forcing vomiting, in fifteen minutes of panic. When information arrives too late, the only instinct left is to harm one's own body.

And there is a detail few notice. Under a strict reading of the rules, the athlete must still monitor her own weight, even when told she is not on the list. Technically, she may not be fully absolved. But placed side by side, the asymmetry is stark: the athlete bears the competitive penalty — disqualification — while the proximate cause came from the staff's wrong information, repeated twice.

More dangerous than the 100 grams is the behavior it triggered. Forcing oneself to vomit to lose weight can cause electrolyte imbalance and place stress on the heart, though the short duration here may have limited acute risk. But the signal is already clear: this is textbook desperation behavior in rapid weight-cutting, a red flag for health.

For someone who has followed combat sports for many years, I do not think this story ends at a disciplinary decision. It opens a question about design. When the random check list is finalized only an hour before matches and relayed through a single channel — the coaching staff — then any small error can turn into a disaster for one person. An independent verification channel for the athlete herself — a direct message, a longer window — could have saved an entire career.

I write slowly because I want to remember for a long time, like someone keeping the rhythm for the whole field. Perhaps that is why I notice things that do not appear in the record books. What troubles me does not lie in the 100 grams, but in her own words: she felt "extremely ashamed," her mental state "unstable," and she may no longer have the chance to continue her athlete career. In the lightest category, where the gap between success and failure is as thin as a sip of water, psychological weight is what can end everything — faster than a single missed weigh-in.

The stands were empty, but I heard the applause of someone who did not give up. Every season has its own heartbeat, if only one takes the trouble to listen. And sometimes that heartbeat is not on the mat, but in the choked breath of a person standing before a scale.