Learn the correct techniques and
basic fundamentals of boxing
at William Street Gym
Learn the correct techniques and basic fundamentals of boxing at William Street Gym
At William Street Gym in Caulfield South, we don’t just teach boxing — we teach craft, discipline, and self-respect.
Our coaches aren’t just fitness professionals — they’re lifelong students and teachers of the sport. With decades of combined experience in boxing, coaching, and exercise science, they’re here to do more than make you sweat. They’re here to help you learn the art, build real skill, and train with intention.
We believe that boxing should challenge your body and sharpen your mind — and that every jab, every drill, and every class should move you forward. Whether you’re here to build fitness, learn self-defense, or pursue boxing at a competitive level, we’ll meet you where you are — and help you grow from there.
At WSG, it’s not about fast fixes. It’s about putting in the work, earning your progress, and discovering what you’re capable of — in the ring, and beyond.
The Right Tools for the Work
The Right Tools for the Work
At William Street Gym, we don’t do luxury — we do what works. Our space is designed around the essentials of real boxing training: nothing fancy, nothing wasted — just everything you need to train properly and improve over time.
We’ve got a full-sized boxing ring, rows of Fairtex and Aqua bags, quality mitts, gloves, and ropes, and a spacious floor for footwork, drills, and shadowboxing. Mirrors on the wall help sharpen your technique. The ring’s there when you’re ready to step into it — but it’s earned, not rushed.
Everything here serves a purpose: to help you practice with focus, move with intent, and develop real skill — not just burn calories.
The William Street Gym Team
Sy Nadji
Founder & Head Coach
Sy Nadji brings over 30 years of experience in combat sports, coaching, and exercise science to William Street Gym. His journey began at age 12 with Taekwondo, eventually leading him to the sweet science of boxing — a discipline that’s shaped his life ever since.
By the age of 27, Sy had opened his first gym. Since then, he’s built a reputation as one of Australia’s leading fight promoters, known for running some of the country’s most respected combat events. But beyond fight nights and titles, Sy’s true passion lies in developing skillful, well-rounded boxers — from absolute beginners to seasoned pros.
At WSG, Sy leads with a philosophy rooted in technical excellence, safety, and long-term growth. His focus is not just on fitness, but on teaching proper boxing technique — because real progress comes from mastering the craft. Whether you’re here to get fit, learn the art, or one day compete, Sy’s coaching ensures that every step is earned, respected, and built to last.
Silvia Bettoni
Boxing Coach
Silvia Bettoni’s journey in martial arts began before the age of 10, training in Karate and developing early roots in discipline and movement. Nearly 15 years ago, she turned her focus to boxing — drawn to its depth, challenge, and personal rewards.
Silvia first walked through the doors of William Street Gym as a member, committed to learning the craft. Through years of consistent training, she went on to represent WSG in multiple competitive bouts, embodying the gym’s ethos of earning each stage of development. Today, she brings that same mindset into her role as a coach.
Silvia works closely with beginners and personal training clients, guiding them through boxing’s fundamentals while helping them build confidence, clarity, and technical skill. Her coaching style is calm, focused, and grounded in the belief that everyone can learn the art — regardless of background or experience.
At WSG, Silvia is a testament to what’s possible when you show up, put in the work, and grow through the practice.
Bobur Najmiddinov
Boxing Coach
Hailing from Uzbekistan, Bobur Najmiddinov brings a wealth of international boxing experience to William Street Gym. A seasoned coach with a deep technical foundation, Bobur has trained fighters across Uzbekistan, Korea, and Vietnam, developing champions at both the amateur and professional levels.
Among his most notable achievements, Bobur was the coach behind Vietnam’s first-ever WBO female world champion, and has worked closely with standout fighters like Oriental WBO Champion Olim “Baby Tyson” Nazarov. His track record includes mentoring a generation of rising Uzbek professionals, known for their discipline, sharp technique, and relentless ring IQ.
At WSG, Bobur brings this elite-level experience into a community gym setting — making world-class coaching accessible to anyone willing to learn. Whether you’re just starting out or preparing for competition, Bobur’s calm intensity, technical precision, and passion for the sport offer invaluable guidance at every stage of your journey.
$99 Introductory Offer
Go all in with our exclusive one-time offer for new members.
Experience WSG One Month Access to William Street Gym, Normal Price is $55 per week for Unlimited Classes. Limited spaces available.
Go all in with our exclusive one-time offer for new members.
Experience WSG One Month Access to William Street Gym, Normal Price is $55 per week for Unlimited Classes. Limited spaces available.