They walk in shy. That's normal. It's also temporary.
Kids martial arts in Balmain — jiu-jitsu for ages 3–14.
First class free · no uniform needed · parents welcome to watch every class
10+ years in Balmain • ⭐⭐⭐⭐⭐ 111 five-star Google reviews
Quiet confidence. Not the loud kind.
Most parents who find us aren't looking for a fighter. They're looking at a great kid who doesn't quite back themselves yet - the one who hangs back at the party, gets talked over at school, gives up when something's hard.
Joel's watched the same arc for ten years: kids start off shy and unsure. Then they get their confidence. They turn into little warriors - but respectful ones. They look out for each other.
The confidence shows up everywhere except where you'd expect. Not in fights - in the classroom, at the school gate, in how they carry themselves. The kind that doesn't need to announce itself.
Book their free class
Three programs, ages 3 to 14 - the first class is always free.
And if you catch yourself curious about training too, you wouldn't be the first parent.
Here's exactly how the trial works.
Before you arrive
Wear anything sporty — no uniform needed for the trial
Arrive 5–10 minutes early so the coach can meet you both
We're upstairs at the PCYC at 372 Darling St, Balmain - parking on the street
During the class
Kids are greeted by name and paired by size, age and experience
Tiny Kids (3–4) is 30 minutes of Jiu jitsu games — balance, coordination, listening
Kids (5–8) and Juniors (9–14) get 45 minutes — real technique, plus the games
After the class
A quick chat with the coach about how they went
No hard sell. You'll leave with a sign-up offer that's good for one week
Don't read too much into a shy first class — the second is usually when it clicks
What parents say when they've been here a while.
All from our 111 five-star Google reviews.
"All my kids attend Joel's classes — I now think that BJJ is as important as Math and English. Joel has a superpower with the kids… kids listen, learn and always wanting to come back."
Emir
"It's wonderful to see my daughter's confidence and discipline grow with each class"
Charris
"The kids are challenged and learn to look after each other."
Parent, kids training here 2.5+ years
"He loves going and has grown so much - not just in his BJJ skills but in discipline, confidence, and respect."
Jess, son training 2+ years
"Every class my son attends, he comes home happy!"
Leesa
A Balmain dad who's coached Balmain kids for ten years.
Joel Costello was born and raised in Balmain. He opened Gracie Balmain in July 2016 - in the suburb he grew up in, for the community that shaped him - and he still teaches most of the kids classes himself. Same coach, same room, ten years.
He's a black belt under Bruno Panno and Royler Gracie, and a multiple Australian and Pan Pacific champion. But the credential that matters to parents: ten years of watching shy kids get their confidence — and he can tell you exactly what that arc looks like, because he uses every kid's name and knows where each one's at.
Behind Joel is a coaching team that's been here for years - most of them his own students who came up through the gym. Vincent started here at 10. He's 18 now and helping coach the next group of kids coming through. Jayden Lawrence - freestyle wrestler and Paris 2024 Olympian — runs wrestling fundamentals.
Ask us anything. Here's a head start.
Will BJJ make my child more aggressive?
Quite the opposite. Jiu-Jitsu builds quiet confidence, not aggression. When kids know how to protect themselves and handle physical pressure on the mats, they lose the need to show off or prove anything outside the gym. They learn to stay calm, clear-headed, and controlled. Over the last decade, Joel has watched hundreds of kids walk in shy and unsure, and walk out as confident, respectful young leaders who know how to defuse conflict and look out for others.
Are they going to get hurt?
Kids are paired by size and experience — never thrown in with someone twice their weight, and no one is pushed into contact before they're ready. Submissions are age-gated and we're strict about it: none at 3–4, control-only at 5–8, taught safely at 9–14. Coaches are on the mats, not watching from a desk. Bumps happen, like any sport. Recklessness doesn't.
Who's teaching them?
Every coach is police-checked, Working With Children cleared and first-aid certified. Joel - head coach, second degree black belt - is a Balmain dad who teaches most of the kids classes himself. Most of the coaching team came up through this gym as students.
Is 3 too young? Is 12 too late?
Neither. Tiny Kids (3–4) is all games — they think they're just playing, but they're learning balance, coordination and how to listen. No submissions, no uniforms, big focus on fun. And kids who start at 10 or 12 catch up fast — Vincent started here at 10, and now he's one of the coaches. One of our members put it best: "My son started at 4, I started at 40. It truly caters to everyone."
My kid has quit three activities this year — what if this is number four?
We hear that a lot, and it's exactly why the trial is free and there's no lock-in contract - you're never paying for something they've stopped loving. But jiu-jitsu sticks in a way other activities often don't, because it's part game, part sport, part puzzle. There's always a next thing to unlock.
What if they can't sit still or focus?
Those are usually our best students. One class of structured, full-body focus does what no amount of "calm down" ever has. Parents tell us the listening comes home with them.