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The story
A post on X (formerly Twitter) claiming, “I’m 154cm and 37kg, but since I do wrestling, I could beat an average man as long as the size gap is within 30kg,” was picked up on 5ch’s Nandemo Jikkyo G board. The poster included a photo standing next to a 102kg man to argue that weight alone doesn’t tell the whole story. The thread brought up real Olympic champions like Tadahiro Nomura, Saori Yoshida, and Kaori Icho, discussing how a difference of just a few kilograms can decide a match in weight-class combat sports, as well as the differences between a street fight and a sanctioned bout — opinions were split over whether technique or sheer size advantage would win out.
What people said
No way. In combat sports, even a 3kg difference changes your weight class.
There was that viral story in the UK about a junior high girl who'd been doing jiu-jitsu for years — she got attacked out of nowhere by some huge guy, broke his ankle with a jiu-jitsu move, and he ended up getting arrested.
Maybe some other sport, but of all things, wrestling? No chance.
Huh, so jiu-jitsu really is the strongest on the street after all.
On the street you'd just get body-slammed and killed, so no chance.
In competition maybe, but in an anything-goes street fight, dropping to the ground right away? Fighters keep saying over and over that's just idiotic.
You could hurt someone if you wanted to, but that takes power too.
Nomura was probably around 70kg naturally back when he was competing, though.
Exactly this. Judo really is the strongest standing style — it's the first thing police learn, after all.
Would he still be fine even against someone swinging a nail bat?
Jiu-jitsu barely teaches standup at all — everyone just wants to go to the ground, which is pointless.
They do teach it — that stuff starts from a standing position too.
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27 years old, 154cm, 37kg
⇑ 𓅓 × 𓃰
⇓ ⇨ 𓂜
15 years old, 179cm, 102kg
＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿◢
Plenty of average guys are around 100kg too though?
Isn't it about technique though? Like if a 37kg weight suddenly got attached to some part of your body, you'd fall over, right?
Maybe there's something like skillfully grabbing one leg to throw off your balance, but after that she probably couldn't do anything.
Ah, this is a case where 90% of the guys on this board couldn't win.
Honestly, I don't feel like I could win lol
Fat guys are actually strong in fights. It's basically like they're living with a 50kg weight strapped on all the time.
Only if they can take it off before the fight… 🥺
Big guys who actually train — judo club, rugby club, sumo wrestlers — those guys are genuinely strong.
But your average out-of-shape otaku fat guy is genuinely weak… A big guy who doesn't play any sport has no stamina or fighting spirit, they're out of breath in like 10 seconds. Just supporting their own body weight is already their limit.
Yoshida's actually pretty small, you know. If it were Kaori Icho, an average guy probably couldn't beat her.
It's not that she 'wasn't sure' — there's just no way she'd win.
That's assuming the high school boy also does wrestling, though.
Just to be clear, it's only because of this size gap that I couldn't win. Against someone closer to an average man, I could still take them down if I wanted to, since I do wrestling. People tend to judge by weight, but I'm not exactly easy to just pick up either.
x.com/water19xjp/sta…
Do average guys even compete in the UFC?
Is there even a weight class that light?
Just pick her up, powerbomb her onto the asphalt, and it's over. 3 seconds, tops.
What do you mean can't last even 20 seconds lolol. Even a NEET could last a few minutes at least.
90kg isn't as fat as you think. To be precise, that's 180cm/88kg — an ordinary middle-aged guy who goes to the gym and plays futsal once a month.
If he's got low body fat at that size, that's already way outside the average build anyway; and if he's got a soft, out-of-shape build instead, he probably has no stamina either.
Also, futsal wrecks your knees, so he should quit that. I used to be in the soccer club and have done karate ever since — once you hit a certain age, if you don't cut weight, moving hard will blow out your knees or ankles.
Blowing out your knees is just the beginning — I've torn my ACL in both knees.
He's obviously just an average guy, however you look at it. If that's not "average," then what the hell am I lol. There's no way I could run a marathon, but at the gym I run 12km/h for 30-40 minutes. My knees and back are totally fine.
Background and Key Points of This Debate
Weight classes in combat sports are built around the idea that even a few kilograms of difference can drastically shift the balance of advantage, and the point raised on the thread — “even a 3kg difference changes your weight class” — is grounded in that very system. That said, the original poster herself limited her claim from the start to opponents within roughly a 30kg gap, saying she couldn’t win against anyone heavier than that. The comparison that came up later in the thread, against a man over 100kg, may actually fall outside the “average man” range she originally meant. It’s also worth noting that Olympic gold medalists like Saori Yoshida and Kaori Icho tend to be smaller in build than the average woman, which makes it hard to judge real fighting ability from body weight numbers alone. The difference between a sanctioned match and a street fight — no rules against fouls, hard pavement, the risk of bystanders jumping in — is a point combat-sports veterans often raise too. Ultimately, there’s almost no real-world precedent testing whether technique alone can overcome a large size gap, so it’s worth keeping in mind that this whole debate remains speculation on the internet.
※This article is excerpted and summarized from the 5ch (Nandemo Jikkyo G) thread “A 37kg woman says, “I do wrestling, so if I wanted to, I could beat an average man”.”
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