Come home to the fittest version of yourself.

We’re all about functional fitness and high quality movement education and coaching, in other words, we teach you to move bigger loads better.

Whether you're focusing on weightlifting or building strength, we’ve designed a training system that lets you choose your track—think CrossFit, but without the higher skilled gymnastics and more focus on strict movement. Our programs also prioritize cardio development, helping you boost endurance and overall health.

But what truly sets Siege apart is our community. You'll experience the most supportive team environment, where everyone is invested in your success. Here, you’ll feel right at home, building healthy habits and smashing your training goals.

Two shirtless young men with tattoos, one with curly hair and one with short hair, are sitting close together and smiling. They are in a gym or fitness area with black walls, exercise equipment, and a wooden box in the background.

Our Services

Check out our class timetable for more info on our training and classes.
Apply for premium 1:1 coaching with head Coach James Kirkby. With nearly 10 years in the industry helping 100s of client's transform their bodies, if you are ready to do the work, James will be there to give you the tools and support.

APPLY HERE
With open gym access available outside class hours, even on day's the timetable doesn't line up, you can still get your workout in.
All memberships include unlimited sauna access and use. We value supported your health in more ways than just training.

Try us for 7 days

A smiling woman with dark hair and a lip ring holding a black leather strap with a metal buckle. The strap has labels with arrows pointing to the front and back; the label near the top reads 'FROM HERE.' in red, and the label near the middle reads 'TO HERE!' in green. She is standing inside a gun shop or shooting range with lockers and a window in the background.

“siege has honestly been the best thing iv’e ever done for myself. the atmosphere there is like no other and it’s given me confidence to do things I would have never dreamed of before starting

Contact us.

hello@siegefitness.au
0439695074

4/82 Glenwood Drive,
Thornton, NSW