Early in my blue belt I started bringing a small notebook to class. Between rounds I’d sit against the wall and scribble down what the coach had just shown. The experiment lasted about three weeks, and the reason I stopped wasn’t anyone saying anything — though I caught a couple of looks. It was that I’d traded my reps for paragraphs, and after three weeks of diligent writing my game hadn’t moved at all.
So the short answer to the title is no: take notes after class. Here’s the longer version, including the one exception I still think is worth the social tax.
The trade you’re actually making
The problem with writing during class isn’t social, it’s economic. A typical class gives you maybe 12–15 minutes of real drilling. Stop to write for thirty seconds five times and you’ve burned a meaningful slice of your reps — and you’ve traded the felt knowledge of the rep for a description of it. The rep was worth more.
There’s a second version of the same math. Your coach showed the technique so you could feel it; the kinesthetic part is the whole reason you’re paying for class instead of watching YouTube. Spending class time translating felt knowledge into words means using the most expensive part of your training to produce a transcription you could have produced more cheaply at home.
The car is the better classroom
The drive home is the part of training almost nobody uses well. You just felt the position, your body still knows the angle, and the details are intact. Sixty seconds of voice memo right then captures more useful information than ten minutes of careful writing the next morning. (The mechanics of that habit are in the 60-second voice note post.)
This is a fidelity argument, not a discipline argument. The specific phrasing of “he kept his weight on my far hip the whole pass” decays within hours. By the next morning the same memory has smoothed into “he passed my guard” — technically true and almost useless.
The one exception
There’s a single case where writing during class pays off: your coach drops a long verbal cue you know you’ll forget verbatim. Something like “the key is keeping your trailing knee inside their lead hip, never outside, even when it feels wrong.” Phrasing like that decays even faster than positions do, and direct quotes are worth jotting between rounds.
My rule for myself: only direct quotes from the coach, never my own analysis. The moment I start writing my own takes mid-class, I’m back to trading reps for paragraphs. I also keep the phone in my bag rather than matside, so capturing anything requires getting up — a small tax that filters out everything except the quotes that genuinely matter.
What I do now
In class, I drill, and I pay attention to the one thing the coach repeats. Every coach repeats one thing per class, and it’s almost always the part that matters.
In the parking lot: a sixty-second voice memo with the one detail and the one mistake from the rounds. That evening, if the energy is there, I convert the memo into something with structure. Many nights I don’t, and the memo alone still does its job.
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The best note-taking system is the one your coach doesn’t notice. Capture after class, structure it later, re-open it before the next one — and class itself stays about drilling, which is what it should have been all along.
Common questions
Is it weird to take notes during BJJ class?
Yes, a little — and not because note-taking is bad. Most coaches would rather you drill the rep than write about it. The fix is to capture after, not during.
When should I actually write down BJJ techniques?
Within an hour of leaving the gym. The drive home is the sweet spot. After that, the texture starts decaying.
What's the best format for BJJ notes?
Whatever preserves the decision tree — usually a flowchart or sketch, not a paragraph.
