Quite simply this is the only gym I have ever joined and actually kept going to! I've always been sporty but never into the gym, but this place makes you want to come back as its really great fun. The workouts are well planned and considered and take into account everyone's ability. Rob and Jenna are absolutely brilliant coaches and lovely people too. They take the time to make everyone feel welcome and the community is incredibly supportive. What's even better is that it's not all about working out as there is a great social side to the gym with regular meet ups and events in the area. 100% recommend you to give it a try.

I’ve been a member at GU for nearly 3.5 years, originally doing a drop in class once a week and very quickly building up to a full membership, visiting 4-5 times a week. The coaches are knowledgeable, patient and friendly; they care about all members and help them on whatever fitness journey they are on. Programming of every cycle is second to none. Time is taken to ensure technique and foundations are in place but also pushing you to strive and improve to hit PBs or your goals. The community built at GU has to be the best part and really speaks for itself. There is no ego here and it's the most welcoming atmosphere - if you’re new to CrossFit, want to try something new or looking for a fun place to work out then I couldn’t recommend it more!

Surely one of the best reasons to live in Berkhamsted! 🏅Rob and Jenna have created an incredible, supportive and fun gym and community. I was new to CrossFit and had never kept up a gym membership for longer than 3 months before coming here…that was nearly 4 years ago and I’ve been coming to classes here 3 times a week ever since. I love how encouraging they are as well as knowing when to push you. The supportive environment and community are testament to Rob and Jenna’s personalities, hard work and passion for exercise. Just great for your physical and mental health - I love it! 🤩

Jenna and Rob at GU are the best coaches. I’ve been doing CrossFit for a while now and I can safely say that the classes, equipment, facilities and most importantly, the people make it. There’s no ego in the room, just really great programming and an inclusive culture. I’ve met some awesome people at GU, and since joining I’ve hit a number of PB’s on my squat, clean, snatch and more. Couldn’t recommend a better gym. Check it out 👊🏻💪🏻

Crossfit isn’t a gym it is a community and Grand Union is an exceptional example of this. I started here 3 years ago after 2 years of crossfit experience. The smaller size of classes means you learn a lot from the coaches and really improve on technique. The programming is challenging but fun and achievable. The best thing is there is very little ego at GU, everyone is really lovely, friendly and encouraging as can be seen at the various competitions members sign up for. I would recommend anyone looking to improve their fitness levels to come try it, a decision you won’t regret.

Ive been going to GU CrossFit for 18 months now and joining here was one of the best things I have done. It’s so much more than just a gym. Not only is Rob and Jenna ‘s programming is top level, making every class fun and challenging but the biggest part for me is the incredible community vibe they have going on down there and everyone leaves with such a buzz. #wearegrandunion✌️

Joined Grand Union CrossFit just over a year ago when I moved to the area and would highly recommend for anyone interested in taking up CrossFit. Jenna and Rob are incredible, they have created a gym full of energy, fun and community. As someone new to CrossFit, I felt welcomed immediately and they both have supported me to build confidence and progress my strength and technique. They offer a range of memberships and classes which is awesome to tailor your training towards your goals around a busy work schedule. I love their small classes and 6 week programming because you get personalised coaching and can easily track your progress! Highly recommend for anyone looking to push their fitness to a new level!

I have never seen such an improvement in my fitness after joining a gym... My cardio health and recovery rate improved markedly within a month or so and I felt empowered enough to take on my first Hyrox at the ripe old age of 48. Rob and Jenna as coaches are the right mix of incredibly supportive, knowledgeable and motivational - and they really have the skills to back everything up! The community they have built at the gym is really something - no showboating here - just positive people working to make a difference to their health, mental and physical. What a team!

Joining Grand Union CrossFit has been the best fitness decision I have made in years!! Rob and Jenna have created a wonderful community with some of the best coaching I have ever experienced. The workouts are brilliant with great variety and so much support within a really friendly atmosphere. There’s never any judgement from anyone and I’ve made some lovely friends since I’ve joined. Add to this absolutely banging tunes to workout to. Sign up, you will not regret it!!

Grand Union is more then just your local functional fitness gym. The coaches are genuinely passionate, highly experienced and they actually care. In a crowded market with too many options Grand Union sticks to it's values and absolutely nails it.

I LOVE it here. I hadn't done crossfit before joining about 10 months ago and I can honestly say that I now love going to the gym and actually miss it when I'm on holiday! I'd never really tracked what I'd been doing at the gym before but the six week programmes and app make it so easy to see your progress. My strength and fitness has improved a ridiculous amount and I'm so much more confident and happy in my body than I was when I started. Rob and Jenna are so fantastic and have pushed me to do things I never would have attempted before. Everyone is super friendly and supportive and the small classes mean workouts can be adapted for all abilities, sizes, preggos, you name it, so it really is such an inclusive place. If you're not sure about joining, just join.

I’ve been part of GUC for 3.5 years now and have to say it’s the best gym I have ever been a member of. I normally get very bored in gym classes but at GUC, every class is varied, engaging and you’re encouraged to track progress so you clearly see results. It’s a great workout- my fitness levels have improved massively but there’s also a big focus on technique and retraining bad habits in workouts to avoid any injuries. Rob and Jenna are incredibly knowledgeable, passionate about what they do and really care about helping people achieve their goals. They have built a friendly, all-inclusive community with regular social events, so it feels so much more than just a gym. Most importantly, they have impeccable taste in music and play the best playlists during every workout!

I could write books about how amazing Grand Union is! After years of enjoying fitness but not finding my place I really feel I belong at GU. Everyone is incredibly supportive and friendly and it really does feel like a family! Rob and Jenna are absolutely amazing, inspirational coaches, they really care about everyones individual journeys and make hard work feel exciting! Their great programming means anyone and everyone can join and feel they have achieved something in every class! Going to GU is my favourite part of the day, it not only makes me physically stronger but mentally stronger in day to day life! I could go on and on but if you are thinking of joining I couldn't recommend it enough!!!!!!!

Grand Union CrossFit is one of the best gyms I’ve ever been to! GU has highly experienced motivational coaches who help you reach your goals with well planned programmes! Rob & Jenna are super welcoming and have created an amazing community filled with likeminded individuals of all ages and abilities and has proven that CrossFit really is for everyone 🫶🏽 (their music taste is also top tier too) I enjoy every class I attend and not only has my physical health improved but so has my mental health! Absolutely 100% recommend!!!

GU Bingo has been a revelation & an innovative idea not just for the members of the Grand Union CrossFit, but allowing the wider network of friends to join in too. The workouts have been tough but varied & highly rewarding. Thank you to Rob & Jenna especially for organising such a great month long event!

I have been a member of GU from when it initially opened, and can honestly say that joining here was one of the best decisions I've ever made! I was always quite nervous in gyms, with not much self confidence or belief in what I could do; but GU has changed all of that, and I am now physically and mentally the strongest version of me! Not only that, Rob and Jenna have created such a welcoming community that shows support and encouragement for everyone, and from this I have made lots of friends along the way. The last year has been hard on everyone with the pandemic, but these guys have shown so much support for members and non members alike, with challenges to keep us busy over lockdown, as well as promoting support for local businesses in the area. So much love for GU and for everything it's about! <3 X

Grand Union is a very warm and welcoming box with an encouraging and cohesive atmosphere. The coaches are highly knowledgeable, personable and really get the best out of you in every class. The spirit that has been built in such a short time is testament to Rob & Jenna and their warm and welcoming ways. Don’t get me wrong though, they will push you to hit that next PB! Rob and Jenna have gone above and beyond to encourage members to keep active during each lockdown of 2020; from lending equipment, to hosting free zoom classes and setting monthly personal challenges and team competitions! The members at GU will rally around each other and make anyone feel like part of the team, regardless of age, ability or experience. I feel that GU perfectly embodies what crossfit is all about; functional fitness for all.

One of the most professional and dedicated gyms around. Rob and Jenna are such great people, you can really see the love that they have for the CrossFit community, as well as the local community in Berkhamsted and surrounding areas. Their hard work really shines through in everything they do, despite being closed over many months of lockdown they have persevered and driven their members to stay fit. They've done zoom classes and free to all sessions on many occasions. My experience is largely from the community work-out bingo (GUBingo) where I experienced Rob and Jenna's drive and motivation, it really challenges you to do the maximum you can. A massive thanks to them for the challenge!

I joined GU Crossfit in October 2019 after a friend recommended it and I have not looked back since. The owners and coaches are brilliant, extremely knowledgeable and patient when teaching new skills. I tended to stay away from gyms and weights especially, but they have given me the confidence to use a gym. The community as well within the gym is brilliant - couldn't recommend it more.

I have been going to Grand Union CrossFit for about a year now and it is the best gym, it is my favourite place to go to set me up for the day or unwind after work, I always leave feeling really positive. Rob and Jenna are brilliant coaches, I learn and improve something every time I go. Their programming is fun, varied and challenging and they also encourage everyone to do their best. Not only are they incredibility knowledgeable, they have created such a friendly community, and I’m so glad I am part of it. When I first joined everyone made me feel really welcome and that is testament to the environment they have created. They also really care and go the extra mile for every individual; I recently had an injury and they adapted every work out for me for about 3 months so I could keep on training. SIGN UP! You will not regret it.

More than just a gym! I have been at Grand Union CrossFit since they opened. I have never stuck to one form of training for long as I used to loose interest and find something new... until GU. I absolutely love the work outs, they are constantly changing and keeping me excited to return. They are very inclusive and make it suitable for all levels to push themselves. The gym is made even better by the amazing coaches, who take time in focussing on everyone individually and pushing us to improve. Last but not least the gym members are all so lovely and many friendships have been formed, making the many events they put on through out the year amazing!!

I joined this Crossfit gym run by Jenna and Rob in May 2021 and I am so pleased that I did. I was out of shape after childbirth and lockdown, so the idea of joining a gym was daunting. I needn't have worried. The last 21 months or so have been the longest I have ever stuck to an exercise regime. The results are not only visible, but I also feel fitter, stronger and my core has never been this tight (thank you Jenna for introducing me to hollow holds). Classes are kept small in size, are varied and cater for mixed abilities, as long as you are willing to try your best. The coaches are knowledgeable, personable and clearly have a passion for their work. A further upside is that this gym, situated in the heart of Berkhamsted, has a strong social ethos which leads to a feeling of comradery amongst members; there is opportunity to socialise after training in the local amenities or join in on socials organised by the gym and make new friends. I am very happy I joined Grand Union Crossfit and can only recommend it.

I joined GU 18 months ago after moving to the area. The classes continually push me to learn new skills and reach new goals. Rob and Jenna are encouraging, knowledgable and welcoming coaches. A great gym and a great community to be a part of.

I joined GU nearly 2 years and can honestly say best decision I ever made ! the change in me is noticeable to everyone , not just my physical changes ( but i have got very strong !!!! ) but the mental impact is something i never expected ! I am calmer, happier, sleep better and feel mentally stronger . I have set myself so many goals that I have gone on to smash and its feels great ! The difference with GU than other gyms is the people, Rob & Jenna are fantastic coaches and have created something unique , a family , a community where people support each other, root for each other ! I have made some dear friends here ...... as I said joining was the best thing I have ever done

Joining a couple of years ago was one of the best decisions I’ve made. I was always intimidated in conventional gyms and to be honest had absolutely no clue what I was doing! However with GU, it feels like a personal training session every time with small classes, one-to-one feedback and constantly varied cycles that have helped make me fitter and stronger than ever. Not to mention it has a great community aspect with friendly members and regular social events.

I have been a member at GU for almost two years having not previously done CrossFit and cannot recommend it enough. Coaches Rob and Jenna genuinely care about everyone’s progress no matter what ability they are and it’s the first time I have gone to a gym and not only seen my own fitness improve but that of literally everyone around me. There is a great GU community and a fantastic positive atmosphere when you’re training. The class schedule is constantly being updated and is really varied and for the first time in my life I can say that I genuinely look forward to going to the gym!

GU is a great gym to be a part of, Rob and Jenna are fantastic coaches and super knowledgeable. No matter what your fitness level or ability is, they cater for everyone. It's a great community to be part of. Great programming too - at GU they do 4-5 week cycles so you’re able to see your progress throughout! Can’t speak highly enough.

Grand Union is a really welcoming CrossFit gym with really friendly coaches and members. The programming is great, with structured cycles focusing on specific movements for 6 weeks. I have improved on everything since joining about a year ago - olympic lifting, gymnastics & general fitness. One thing I love is that the classes are really small so you don't feel ignored. Thank you Rob & Jenna!

I've been a member of this box for almost a year now. Myself and husband moved to the area and were looking for a good gym to join - we did a trial session with the coaches and loved it. I had some previous CF experience but since coming to GU I have improved in every aspect - gymnastics, fitness and strength. Rob and Jen, the coaches, are really supportive and encouraging to every member - no matter your own fitness background. The programming from the coaches, in my opinion, is guaranteed to make you progress. CrossFit gyms are generally more expensive and I used to grudge paying that for something that wasn't really worth it. But at GU you feel like you are always at a personal training session in every class. If there's an exercise that you don't feel comfortable with, the coaches are more than happy to give tips and tricks to get better at it. Both Rob and Jen are a massive inspiration to me on a personal level from running their own businesses and they also happen to be very fit and strong too :) For anyone that's thinking about trying it out - just do it, there's diffrent aspects to Crossfit that you will love more than others. But you couldn't pick a better gym to try it out than at GU!

If you're looking for buff units, look no further. Just joking, GU is much more than a gym, it is a community. Most people who have joined in the last three years are now part of a wider social circle that is as well known for legendary parties, as it is for PBs and physical development (but there is a lot of that too). Rob and Jenna lead from the front, and they are as pateint as they are demanding.

Great Box- Jenna and Rob are amazing, the workouts are tough and there's a great community feel to it. Wouldn't want to go anywhere else!

I never stuck to any sport in my life… until GU CrossFit…. Best coaches, who are kind, fun, push you. They created the most wonderful CrossFit community in Berkhamsted, exercising is fun and I have seen amazing results in my fitness.