A new level of fitness

The Gym That Gives You Real Results

Join our friendly fitness community with gyms in Brighton, Newhaven and Tunbridge Wells. You bring your goals, we bring passion and determination. You'll find a wide range of equipment and classes to get stronger, fitter and more confident. We've created the ultimate fitness playground so you can learn about strength, fitness and combat at your own pace. Find out why we won "Best Independent Gym on the South Coast" by having a live chat, booking a tour or signing up today…


It's more fun together, so sign up for our wide range of classes. Focus on your own goals whilst making friends or trying a new sport... whatever you choose, you'll find great instruction and a friendly community ...

See our timetable to get inspired.

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Two people - a Black man in late 20s early 30s and an East Asian woman of a similar age - standing. The man is wearing a dark blue t-shirt with a yellow 'Underground Gym' logo and the woman is wearing a pale pink hoodie with a yellow 'Underground Gym' logo on

Underground Gym Shop

Buy the latest Underground Gym apparel and get it delivered to your door.

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Underground Online - Online Fitness Classes

Whatever your goal, you can train smarter with our top Personal Trainers and Coaches – all from your living room. With Underground Online you will never be without a workout again.

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1 Free Personal Training session When You Join

Take your first step on the road to fitness and be part of the family with a FREE personal training session. This session is 100% about you, so get ready to find your strengths and stretch your goals.

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What our customers have to say

  • Francine DOICK

    Francine DOICK

    3 months ago

    Great gym really friendly staff an customers who if u needed to will help u use equipment if u ask great experience
  • Aaron Edwards

    Aaron Edwards

    3 months ago

    Fantastic gym, fantastic staff
  • Michael Hodges

    Michael Hodges

    9 months ago

    Awesome gym. Started going here a year ago now and will never look elsewhere. Huge gym, great range of quality equipment, loads of space - it doesn't matter what time of day you go or how busy it is, you can always do the workout and exercises you want. Great staff and lots of classes available too.
  • JoBo Curl

    JoBo Curl

    3 years ago

    New equipment, spacious and light, friendly helpful staff plus got sauna compared to its sister gym in brighton
  • Chris Page

    Chris Page

    8 months ago

    Great gym, every piece of equipment you could want and plenty of it. Nice atmosphere, friendly and reasonably priced!
  • Bradley Fry

    Bradley Fry

    3 months ago

    Friendly staff and good distancing measures.
  • Jamie Brown

    Jamie Brown

    a year ago

    Joined back in April, have really enjoyed my first 6 months at this gym. It has loads of equipment so you don't spend time hanging about waiting for others to finish. The staff are excellent and are all very welcoming. Early morning classes are a huge plus for me too. Easily the best gym I have been too and good value for money too. Only gripe is that the showers could be upgraded a bit but other than that no complaints.