A New Level of Fitness

Underground gym

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Join now and get 50% off your first month's fee as a member

Where results meet revolution

Dive into the heart of fitness with Underground Gym, thriving in Brighton, Newhaven, and Tunbridge Wells. From state-of-the-art equipment to adrenaline-pumping classes, we've crafted the ultimate fitness arena.

Outstanding Support
for Your Fitness Journey

At our gym, we’re dedicated to supporting your fitness journey. Our team provides personalised guidance and expert advice to help you achieve your goals and make the most of every workout.

3000+

Total Clients

25+

Expert Instructors

10+

Years in Operation

Classes STRONGER TOGETHER

Our classes are about more than just breaking a sweat—they’re about building a community. Whether you're pushing your limits in HYROX or having fun in Spin, you’ll find support, laughter, and maybe a little friendly competition. 
With flexible class times that fit your schedule, it’s easy to stay motivated and inspired.

View CLASSES

personal trainers guides to your fitness goals

At Underground Gym, our trainers are your partners in progress. Passionate and expert, they provide the guidance and motivation you need to achieve your goals. Whether mastering a skill or getting that extra push, our specialists are here to support you every step of the way.

View trainers

"Being a part of the fitness center has truly transformed my life. I can't emphasize enough how much of a game-changer it has been for me."

Connor macmohan

CEO

"I'm thrilled to be a member of Gymaxion Fitness! The personalized attention from the trainers has made all the difference in my progress."

Willshare ahmad

Marketing Officer

"I couldn't be happier with my decision to become a Gymaxion Fitness member. The positive and welcoming atmosphere made me feel comfortable right from the start."

john cenna

Head of Design

"Joining Gymaxion Fitness has been a game-changer for my health and well-being. The facility is clean, well-maintained, and equipped with the latest technology."

deron william

Head Marketing

pushing the limits together

Dive into the heart of our Brighton Underground Gym community and see what our happy members have to say about us.

JOIN THE UNDERGROUND

WHERE RESULTS AREN’T JUST PROMISED—THEY’RE INEVITABLE

We’re all about real gains, real guidance, and real grit. Our lineup spans from strength building to a vibrant fitness community. Become a member and start seeing the results that only the Underground can deliver.
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Ready to transform?

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Flexible Membership

No Hidden Fees