Some words stop meaning anything when too many people use them at once. "Community" is one of them. Brands have communities. Apps have communities. Newsletters with three subscribers and an unlocked Discord channel call themselves communities. By the time you've heard the word twenty times this week, it's noise — and that's a shame, because the thing the word originally pointed at is one of the most predictive variables in the entire wellbeing literature.
I want to make a careful argument here, because the alternative is the sloppy one — "BJJ is good for your mental health!" — that gets repeated by every gym in the world and earns the eye-roll it deserves. The thing that's actually going on with a real training community is more specific than that, and more interesting.
What we know about loneliness
The frame I want to use is the one Vivek Murthy, the former US Surgeon General, set in his 2023 advisory on loneliness and isolation. The headline finding is that the mortality risk of chronic loneliness is comparable to smoking 15 cigarettes a day. That number got the press, and it's worth keeping in mind because it sets a scale: loneliness isn't a vibe, it's an exposure with quantifiable health cost.
The structure underneath is more useful than the number. Murthy lays out three dimensions of social health that all need attention: structural (how often you see other people), functional (whether you can access support when you need it), and quality (whether the relationships are meaningful). The pattern he documents is that modern adult life — particularly for high-functioning professionals in cities like Düsseldorf — tends to under-deliver on all three at once. You see your colleagues, you have a few close friends scattered across cities, you have a partner if you're lucky, and the ratio of asynchronous-text-message contact to physical-co-presence contact has been quietly drifting toward asymmetric for years.
The thing that makes a martial-arts academy — or a choir, or a Saturday-morning football team, or a serious craft class — interesting from this angle isn't the activity itself. It's the structure of the social bond it produces, which is different from the bond a Slack channel or an Instagram following produces in three specific ways.
Three structural features of a real community
1. Repeated physical co-presence
You see the same people, in person, two or three times a week, for a long time. Not occasionally. Not at a conference once a year. Twice or three times a week, every week, for the next few years. The brain treats this differently from text contact in ways that are genuinely measurable — vagal-tone studies, cortisol curves, the whole basket of "is this person safe" signals that your nervous system runs in the background.
This is the boring core of the argument. Your training partners' faces become familiar to your nervous system in a way that 200 LinkedIn connections and 1,000 Instagram followers don't, even if the LinkedIn connections include people you "know" much better in some abstract sense. There's an old idea in sociology — Mark Granovetter's strong-vs-weak ties — that gets at this. Modern adult life is increasingly weak ties optimised. A training community is one of the few remaining places where strong ties form on a normal weekly cadence by accident.
2. Shared difficulty
You struggle next to someone, repeatedly, at something you both know is hard. Not in a competitive way. In a practising-together way. They watch you fail to do a technique. You watch them fail to do the next one. Six months in, you both can do both, and there's a residue of mutual respect that's almost impossible to fake.
This is the variable that gym memberships built around solo cardio machines explicitly don't have. You can spend 10 years on the elliptical at a commercial gym and never have anyone watch you fail. The failure-witnessing is the ingredient that makes the bond stick.
BJJ is unusually good at this because it's a sport with no place to hide. The technique either works or it doesn't, on the spot, in front of a partner. There's no posture you can adopt that obscures whether you're improving. That's confronting in week three. By month six, it's the part of training people miss most when they take a break.
3. Named partners with reciprocal accountability
You don't train "in a class." You train with Anke, then with Phillip, then with Mirko. Specific people. Their names. They notice when you're not there. They text the group when they're sick. There's a low-grade obligation to show up — not because the academy enforces attendance, but because you said you'd be there for someone's drilling on Wednesday and a person is waiting for you.
Robert Putnam called this specific reciprocity in Bowling Alone — the kind of small, repeated obligation that generalised online communities can mimic but rarely produce. It's also one of the variables that predicts whether someone keeps showing up across a 12-month window, which is the actual currency in this kind of work. Skills compound only across people who don't quit.
Why the post-class hour matters more than the class
Here's a thing nobody puts in the marketing materials: the most psychologically valuable hour of the week at most martial-arts academies is the hour after class, not the class itself. People hang around in the changing room. Someone asks if you've eaten. Two members go for a beer or a coffee. By the time you're three months in, you have plans on a Friday night that weren't in the plan three months ago.
This is the bit Ray Oldenburg, the urban sociologist, was getting at when he coined the term third place — the spaces that aren't home and aren't work but are where adults form non-instrumental relationships. Third places used to be churches, pubs, neighbourhood cafés, men's-shed style associations. Modern German cities have fewer of them than they used to. A jiu-jitsu academy is one of the remaining ones, structurally, even if nobody talks about it that way.
If your week has work, home, screen, and one or two scheduled-by-app meetings with friends, you have a structural deficiency in third places. It's a real thing, it has a real cost, and the cost compounds.
The mental-health argument, made carefully
I want to be careful here because there's a version of this argument that overpromises. "BJJ cured my depression" is a common claim on the internet and it's mostly not true in the strict sense. What's true is that a) consistent vigorous physical activity has well-documented effects on mood, b) social connectedness has independent effects on mood, and c) BJJ is one of the few activities that delivers both reliably in the same hour. The compound effect — exercise + community + practiced absorption in a hard skill — is genuinely larger than either component alone.
If you're dealing with a clinical-grade mental health concern, please see a clinician. Nothing in this article is medical advice, and any academy that markets itself as a substitute for therapy is irresponsible. What an academy can be is the structural underlayer that makes the rest of the work easier — the place where your week has people in it, and where the people know your name, and where for 85 minutes three times a week you're doing something that requires your full attention.
What we try to do at Imperial Ground
The above is the framing. Some of what it implies in practice:
- Structured beginner curriculum. Beginners share an experience — same techniques, same week, same drills — which gives them something to talk about with each other on day one. Ad-hoc classes don't produce that.
- Coaches who learn names. Every member is greeted by name on arrival. This sounds trivial. It's not.
- The post-class hangout is welcomed, not rushed. Mat closes when people leave, not at a clock-time.
- A women's-only program for members for whom the demographic mix of a general class would be a real friction point on the way to community.
- An anonymous Speak Up channel (/account#speak-up) so the community-bond doesn't have to bear the weight of a mistake nobody felt safe naming.
- Code of Conduct (/code-of-conduct) that's specific about what behaviour the community expects, in writing.
None of this is unique to Imperial Ground. It's a list of things any serious academy should be doing. I'm spelling it out because the difference between an academy that produces real community and one that doesn't isn't usually the technical curriculum — it's whether choices like the ones above are deliberate or accidental.
What this looks like for the person reading this
If you're a 30-something professional in Düsseldorf, working remote or hybrid, with a few close friends scattered across cities, who's noticed that your week is structurally a bit empty even when objectively going well — this is the failure mode the structure above is designed for. You don't need a martial art for this; a choir works, a basketball league works, a serious pottery class works. What you need is something with weekly cadence, named people, shared difficulty, and a third-place hour after.
BJJ happens to deliver all four reliably, with the additional benefit that it also makes you stronger and more durable on the way through. That's the whole argument. The first class is free.
João Macedo is the founder and head coach of Imperial Ground Martial Arts in Düsseldorf-Derendorf. Black belt under Alliance, ~14 years training, day job at Vodafone Germany.