The center is an official CrossFit® affiliate. Last checked: 20/10/2025
CrossFit is a registered trademark owned by CrossFit, LLC, which is not affiliated with FitFit UK.

Information about CrossFit® TBB
BT5 5DX, Belfast
Opening hours
- sunday: 5h-23h
- monday: 5h-23h
- tuesday: 5h-23h
- wednesday: 5h-23h
- thursday: 5h-23h
- friday: 5h-23h
- saturday: 5h-23h
Services, Machines and Guided Classes
CrossFit® TBB: Opinions
Fantastic experience: Amazing box with a welcoming and friendly community.
Fantastic experience: The Building Box has been monumental in reigniting my love of exercise after covid! The well kitted out gym offers 24/7 finger print access and an enjoyable range of classes that are tailored to all abilities. The instructors are knowledgeable and supportive, encouraging members to push their capabilities in a safe and enjoyable manner. Couldn't recommend The Building Box and its great community enough!
Fantastic experience: Honestly the best gym you’ll ever go to! 5 star people, 5 star classes, 5 star facilities! I was hating the gym but since I joined CrossFit TBB, I am in love with exercise again, they can’t get rid of me, even though they might want to at this point! Perfect if you are a beginner(like me) or more skilled, programming is brilliant to push you at whatever ability you’re at, coaches are top class! The best community of people you’ll meet, super supportive and not intimidating at all but still everyone pushes each other to be better! I only moved to Belfast a few months ago and have already made so many unbelievable friends, so much love for this gym! After this review you’d be dumb not to go…
Fantastic experience: I’ve been at the Building Box since summer 2021 and it is a fantastic gym. Last year they relocated to a larger space which now includes an ice bath and sauna, which has been a great addition. The gym equipment is fantastic and there is a variety of classes, suitable for all fitness levels. The best thing about the Building Box is the sense of community that they’ve cultivated in the gym. Really recommend coming down and trying it out!
Fantastic experience: Began my membership here when the first lockdown lifted and haven't looked back since. A great space to come and go as you please, with a cool social area if you're the type to bring your work to the gym or fancy a coffee. Hard to beat a recovery session in the ice bath and sauna, which can be included in their memberships. There is a real sense of community to this gym, as the owners are almost always around and the support they offer is amazing. Good music during the HIIT classes, which is scaled for all levels of fitness. I would recommend here for anyone looking to get back into a routine or to up their fitness levels
Fantastic experience: This is a fantastic gym that meets the needs of everyone regardless of their fitness levels. The gym offers a range of different facilities and equipment from the recovery box which has a sauna and ice bath to the social area where you’ll find a microwave, kettle, coffee machine and a fridge of drinks that’s fully stocked. As for equipment there’s basically everything you need and more. There are several classes run every week that are included as part of the membership. They are very high intensity but they’re scaleable so that everyone can participate. I can’t recommend this gym enough and if you’re looking for a fun way to work out come along and have an induction with one of the owners. Everything about this gym keeps me coming back so don’t be shy and pop in!
Fantastic experience: Joined this gym recently & loving it! The community is so welcoming & supportive! The coaches are great at meeting you where you’re at but also pushing you to your full ability! Highly recommend to anyone looking a good workout but wanting to have fun at the same time!
Fantastic experience: This gym is without a doubt the best thing I’ve ever discovered. Extremely reasonable on price and offers classes 6 days a week! You can also get access to their recovery hub which boasts a rustic Swedish sauna and a cold plunge.. brrrrilliant Love this place. Great community and lovely people. Will be back when I get the chance!
Fantastic experience: Fantastic for anyone looking to join a gym and become part of a great community where everyone is welcome. All classes are tailored to allow beginners and advanced to participate and grow. The price for what you get compared to other gyms in the area is superb. Second to none!
Fantastic experience: Building Box offers a great community, challenging workouts, and a friendly and welcoming environment. The community is supportive and encouraging, the coaches are experienced and knowledgeable, and the workouts are challenging but fun. If you're looking for a CrossFit gym that offers all of these things, then I highly recommend Building Box.
Fantastic experience: The most welcoming environment with people of all ages and all levels. There’s always someone to ask questions and the owners are very hands on and encouraging. Would recommend to anyone no matter where you’re at in your health and fitness journey. Best gym I’ve ever been to!
Fantastic experience: Best gym, best people. Love the classes and grindstone training programme so much ♀️ recovery room is a 10/10 post workout.
Fantastic experience: Excellent gym with a great culture. 24hr access which is an added bonus. The ice bath and sauna are great for recovery too.
Fantastic experience: Unreal gym!! Classes are super fun/good for all levels and there’s a really nice community vibe
Fantastic experience: Can’t recommend the place enough, great facility, great group. 5 Stars
Fantastic experience: Tbb- totally bloomin brilliant Defo be back some day soon
Fantastic experience: I did some drop in session whilst in Belfast. What a great gym! They couldn't have been friendlier or more welcoming and invited me to join on a class....which nearly killed me. Five stars all the way!
Fantastic experience: Great local gym with fingerprint access, honesty box and high quality equipment. Fully recommend to anyone looking for a new gym or community to take classes with
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