Independent since 2014
Sol Gilbert and Alan McGuinness opened the first Underground Gym in Brighton in 2014. Newhaven followed in 2017, Tunbridge Wells in 2018. We were named Best Independent Gym on the South Coast in 2019, and we're still independent — which means the people who run these gyms are the people you'll actually see in them.
Founder
Alan McGuinness
Experienced Company Director with a demonstrated history of working in the health wellness and fitness industry. Skilled in Crisis Management, Negotiation, Leadership, Accountability, Leisure Industry, and Management. Strong business development professional with a Master's degree focused in International Relations and Affairs from University of Sussex.
Founder
Sol Gilbert
Sol Gilbert, a notable figure in British MMA, transitioned from fighter to coach and entrepreneur. With a professional MMA record of 9-5-1 and an amateur boxing record of 33-9-2, Sol founded ZT Fight Skool, producing top-tier fighters. He expanded his fitness empire with Underground Gym, catering to diverse clientele, and Coached, a wellness space. Sol’s online coaching business is a six-figure success. Integral to his journey is his wife, Donna Poplett. A father of three, Sol balances family life with his professional endeavors, inspiring many with his dedication and resilience.
Work with us
We're an independent gym group with three sites, and we hire people who are good with members first and good with kit second. If you'd rather work somewhere you're known by name than somewhere you're a number, have a look at what's open.
PERSONAL TRAINERS
a plan, and someone to hold you to it
We choose trainers on two things: they know their subject, and they're good with people who are nervous. Whether you want to get stronger, lose weight or learn a skill properly, there's someone here who does that. Every new member gets a free session with one of them.
Support that actually turns up
You won't be left to work it out on your own. Our coaches learn your name, ask what you're training for, and are on the gym floor when you need them. First session or five-hundredth, same welcome.
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.
Ready to transform?
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