Being publicly bad at something

I train Brazilian jiu-jitsu. I am not going to tell you it made me a better engineer through discipline, or focus, or some tidy metaphor about position before submission. That post has been written a thousand times and it is mostly flattering nonsense.

Here is the part that actually transferred.

Nobody is bad at their job in public

By the time you are eight years into a career, almost nothing you do professionally is done badly in front of other people. You have specialised. You get handed the problems you are already good at. When you do learn something new, you learn it alone — a branch nobody sees, a weekend project, docs at midnight — and you show up already competent.

That is a comfortable arrangement and it quietly narrows you. You start choosing problems by how good you will look solving them.

Jiu-jitsu removes the option. You cannot practise it alone, you cannot practise it privately, and you cannot fake it for even thirty seconds. A blue belt will pass your guard while explaining what you are doing wrong, and you will be unable to stop it while fully understanding the explanation.

The first months are just that, repeatedly, in a room with people you like.

The feedback loop is four minutes

This is the difference that matters most.

In software the loop between a bad decision and its consequence is measured in months. You choose an abstraction in March and find out it was wrong in September, by which point twelve other things are built on it, the reasoning is gone, and the person who made the call — you — has a story about why it was reasonable at the time.

In a roll, the loop is four minutes. You try something, it fails, you know immediately, and there is no story available. You cannot argue with the mat about whether your idea was sound in principle.

Getting used to that cadence made the long loops feel less normal to me. I write more things down now. Not because discipline — because I have felt what it is like to get an answer while I still remember the question, and by comparison, waiting six months to find out I was wrong feels like a choice rather than a fact of the job.

The white belt is the useful state

The genuinely valuable thing is having a place where you are the least competent person in the room, on a regular schedule, on purpose.

It recalibrates what “hard” means. It makes you much more patient with people who are new to something you find obvious, because you are visibly that person twice a week. And it makes it easier to start things you are going to be bad at first, which is most things worth starting.

I do not think the sport matters. Anything works if you cannot fake it, cannot do it alone, and get told immediately when you are wrong.

Most things people pick up as adults fail at least one of those.