Personal Trainers

Train Smarter, Train Harder, Train Refined

Your Personal Trainers in Castle Hill

At The Refinery Studio, we know training should be knowledgeable and based on real experience. That’s why we are the proud host of an impressive collective of trusted, and experienced Personal Trainers within our premium distraction-free training space.

Your Coaches at 
The Refinery

Nathan Merlino, Founder & Coach

Harry Turner, Personal Trainer

josé jurado, personal trainer

Cassandra Araujo, Personal Trainer

Nathan Merlino, Founder and Coach

Nathan Merlino
Nathan understands the demands of the corporate world because he lived them. Formerly a corporate accountant, he pivoted his career to become a personal trainer and gym-owner, alongside becoming a boxer, powerlifter, and marathon runner. This unique background lets him bridge the gap between high-pressure professional lives and high-performance physical health.
Nathan specialises in delivering structured, measurable results through a hybrid and holistic approach to fitness. Whether you’re looking to build foundational strength, train for a specific athletic milestone, or unlock how fitness can enhance your personal and professional life, his coaching is designed to be sustainable and effective for the long term.

Harry Turner, Personal Trainer

Harry Turner

Harry is a results-driven coach who leads from the front, combining an athlete’s mindset with structured, purposeful training. He prides himself on holding high standards while building strong bonds with clients, creating an environment of trust, accountability, and consistency. His coaching goes beyond the gym floor, helping clients build resilience, confidence, and habits that carry over into everyday life. The goal isn’t just to look better, it’s to move better, perform better, and become the best you that you can be.

Harry specialises in weight loss, body composition, and athletic performance. He also plays rugby at a high level, bringing a hybrid approach that blends strength, conditioning, and real-world athleticism into every program.

José Jurado, Personal Trainer

Harry Turner

I love working with people who feel stuck. Not because they haven’t put in the work, usually it’s the opposite. They’ve been training for a while, they’re frustrated, and they’ve hit a plateau they can’t break through.
I get it, because I’ve been there. Starting out is the easy part; progress comes fast when everything’s new. What’s hard is the stretch after, when you’ve been at it a while and aren’t sure anymore if you’re doing the right thing. That’s where most people stall out, and where I like to step in.
I believe training is the gateway to leveling up your whole life, not just your body. My approach is built for the long run: minimal training styles, focused on strength and endurance, introduced in a way that’s sustainable rather than a shock to your system.
The same goes for nutrition. After years of coaching people through their diets, I’ve found the best results come from working with your lifestyle, not against it. Small, minimal changes that fit your life beat drastic overhauls every time.

CASSANDRA ARAUJO, Personal Trainer

Harry Turner

Cass coaches women who want to get stronger and fitter than they ever imagined and actually understand their body in the process.
With 10 years of experience and a background in women’s holistic hormone health, every session is built around the individual (her goals, her cycle, her life) so that training finally works with her, not against her.