Black and white image of a single flower, with the petals and stem in white and the background in black.

Try us for a month

build the body that allows you to perform, regardless of the arena you choose.

see our timetable & Classes

try us for 1 month.
no strings attached

A high standard of functional fitness and movement meets community and homeliness, we’ve been helping the Thornton and Maitland Community feel at home with their fitness for over 5 years.

Find out about our 1 month trial
A smiling man with short gray hair and a beard, wearing a black t-shirt and a wristwatch, standing with arms crossed in a gym. In the background, another man is setting up equipment near a wall and window.

"I absolutely love Siege!"- Sam

"It's such a supportive community"- Lawrence

"Im 41 and have always felt welcomed"- Matt

"I've never foundanother gym with coaches as helpful and welcoming"- Issy

"I absolutely love Siege!"- Sam "It's such a supportive community"- Lawrence "Im 41 and have always felt welcomed"- Matt "I've never foundanother gym with coaches as helpful and welcoming"- Issy

"I'm the fittest and strongest I've ever been"- Scott

"I've made amazing friends"- Laura

"2 years, this is the longest Ive stayed at a gym"- Lydia

"The tribe is like a second family"- Jill

"I'm the fittest and strongest I've ever been"- Scott "I've made amazing friends"- Laura "2 years, this is the longest Ive stayed at a gym"- Lydia "The tribe is like a second family"- Jill

"I'm fitter in my 40s than I was in my 20's"- Patricia

"The details of programming are meticulous and the equipment? Top notch"- Tom

"Nothing else comes close to Siege"- Liam

"Completely changed my life"-John

"I'm fitter in my 40s than I was in my 20's"- Patricia "The details of programming are meticulous and the equipment? Top notch"- Tom "Nothing else comes close to Siege"- Liam "Completely changed my life"-John

Follow us on socials

A man with a beard and red hair in a gym, holding a barbell with red weights, while another person instructs him. The man wears a black T-shirt with 'MUSCLENATION' printed on it and red shorts. Gym equipment is visible in the background.
A group of people in a gym, with one person lifting a barbell with weights, while others watch and supervise in the background.
People clinking cups and bottles during a gathering or celebration.
Three women using rowing machines at a gym, with a man at a counter in the background. The women are dressed in workout clothes, and the gym has a wooden wall and digital screens.
THE GRAM