This gym has a lot of space and great equipment lineup. I can recommend it heavily!

I have been going to The 12 for almost 2 years now. This place absolutely has the best group training classes and trainers in the area...and I have been to a lot of other places. I used to switch gyms every once in a while but since I have found The 12, I am here to stay! Shout out to Nichole and Uli! You guys are the best! They have made working out so much FUN! Love the energy and good vibes here

I recently moved to Costa Mesa and a girlfriend of mine suggested I try this gym! I was a little nervous since I haven’t worked out consistently since before Covid and I feel really out of shape. I went with my friend and as soon as I walked in I was greeted by very welcoming faces and was put at ease. They have a temperature check and require everyone to bring towels to clean the equipment between stations which I appreciated. Once I walked into the main room I started to panic a little because there were a lot of equipment and exercises I wasn’t familiar with. Luckily they go through each station and demonstrate the exercise before we begin. I like that they also have you do mini exercises between stations to keep your heart rate up. I’ve only had Eunice as an instructor and she has been great! I was so pumped after the workout and so excited to get back In shape that I signed up as a member :)

Love The 12!!! Clean, good energy, skillful HIIT training with great trainers!!!!

Ive been a member since 2019 and have loved it ever since! The workouts are different and super fun. The classes are full of energy and the trainers definitely know how to push you!

I’ve been going to The 12 for about 2 years and I absolutely love it. The two trainers I have the most time with are Nichole and Uli they are both fantastic, definitely a major reason I drive to this location even though I live a block from the other location. Uli is a great coach, plays the best mix of music and it’s just loud enough to be motivational. I get to work out with Nichole now more, it’s great that the trainers enjoy working out at their job. You’d never want to eat somewhere the cooks don’t eat right!?

I’ve been attending The 12 for a little over 2 months now and I absolutely love it! It is a super motivating environment with people of every skill level in each class.Nichole’s classes are the best!

Totally worth waking up and coming in at 5am! This gym has the best coaches, management, and community. Not to mention they follow the COVID-19 protocol, making the environment a safe place to get in a good workout.

I enjoy going to the 12 because all of the members are so friendly and push me to get stronger and reach my goals. The trainers are also great motivators and keep the classes enjoyable. It’s so clean and I feel safe! Shout out to Nichole! She is a great trainer!

I have been an annual member for 3 years now and it has changed my entire lifestyle. The trainers are always willing to help and try to motivate. Specifically Nichole is my favorite trainer, she is motivational and seems to know what each person needs individually. She also knows when people need a harder push, she can be abrupt and poignant when it is needed an i love it. Thats saying something with 30-60 people in a class. Ive met Josh and Derek several times and they are extremely dedicated to their business and clients. I love the whole team there and would highly recommend the 12 if you want to make a change or enhance your current physical activity!

The workouts are awesome, science backed, and combine cardio and strength. The trainers are seriously next level good. Motivational, helpful, friendly, and push you to do more.

This is a very personal review of The 12 - Irvine Mesa location....It has been 5 years this month (since March 2016) to when I decided to change the direction of my health. I was 198 lbs and teetering towards the two century mark. For my height and age, it was nothing but all bad!In the timeframe that I have been going to The 12, Ive made personal gains that Im incredibly proud of....With the guidance of all my trainers: Nichole, Uli, Eunice, Brooke, Dana, & Jared, I have maintained a healthier weight and learned to eat better.I have also made some great friendships. Im normally someone whos fairly introverted, but its impossible to not engage with the positivity this gym creates. Egos are checked at the door and you never feel like youre being judged.I got introduced to this gym and the direction of my life has changed.Training is part a healthier you and The 12 fit that part of my life very well, THANK YOU!!

Update on The 12 I now love it even more! I have seen tremendous results and its my first time having access to their nutritionist Nikki Boyd. And with her guidence and the continued support of everyone at the 12 I can say im definitely on the road to becoming my best self.

I have been an annual member of The 12 for the past two years. This place has been life changing for my body, mind, and soul! The trainers and staff give it their ALL every single day. Ive learned so much about fitness and nutrition here. Nichole is my favorite trainer/nutritionist and she has been so inspiring and motivating. She goes above and beyond for her clients. I call this place my second home and owe my complete transformation to The 12!

I recently tried the 12 gym located in Costa Mesa and loving the community and positively of this gym. The trainers really push and motivate you and everyone who attends the classes are always trying their best and pushing you to work harder. Love how the workouts are different every day and also every time you attend and they always play great music.

I have been going to the 12 for 5 years. The trainers are awesome and so are the people. There is a sense of community at the12. I have been training with Nichole for years now and she makes it a point to push me to my limits on a daily basis. I look forward to workouts everyday :-)

I have been working out at The 12 since August. I love the High energy HIIT workouts and awesome community of people.

I’ve been a member at The 12 for just over a year now and I absolutely love it! The workouts are challenging, the coaches are encouraging and high energy, and that camaraderie between members is great! I highly recommend!!

Really like the gym, the setup, and the trainers. Have tried out various gyms, but nothing comes close to what the 12 offers. I have been going there for 5 years now and it has been life-changing.

I love the 12! I’ve been going to the Irvine Mesa location consistently for about 3 weeks and can really feel the difference. This is the most motivated I’ve been to workout in a long time. The trainers are knowledgeable and, even though they can be large group classes, they take the time to get to know you. They also help modify exercises to match your abilities. I can’t wait for class tomorrow!

I loved everything and everyone at the 12. I was on vacation and I love working out so I came to this studio. The 12 coaches and front desk made me feel so welcome. The workout was very challenging and Alex was there to hold us accountable to getting our workout done. I would recommend this gym for someone who is looking to have fun while working out and make changes mentally and physically. So much inspiration to do your best at the 12.

I LOVE the 12! 10/10 would recommend this gym to anyone! Great, challenging classes and friendly, helpful staff.

Clean and fun workout environment! Great trainers!

I love the staff, trainers, group classes and environment at The 12! I push myself harder during the group workouts than I would if I worked out on my own, and we do exercises I wouldnt do otherwise. I feel like the trainers actually care about you committing to your practice and about making sure you do the exercises properly. The music is great, and its fun to train with your friends!

Alex and Nichole (really all of the 12 trainers) are two of the most amazing, inspiring, motivational people I have ever met. They make me bust my butt every class, hold me accountable, and help me to achieve personal goals. They genuinely take the time to get to know you on a personal level, which in a group setting you would think is almost impossible, but they do it and do it so well!! You can really tell that helping people achieve their goals is why they do what they do.The 12 promotes a community culture and people from all backgrounds, ages, and fitness levels are welcomed and accepted. This type of environment makes it so much easier to adapt when everyone is so welcoming and non-judgmental. The trainers will not tolerate it otherwise, seriously.The facilities are great, always kept very clean. Love the products/supplements that are recommended to help with recovery, fat loss, and muscle building.

This is my one of favorite places to work-out. Now that COVID destroyed a lot of gyms and work out places, this is the best one. Pre-Covid, it was pretty good. I like all the trainers. The staff is nice and the place is clean.

The 12 ReviewI started going to the 12 in June. They we were running a monthly special(not available anymore) so after doing my free trial class I immediately signed up. The regular price comes in at $189/month which sounds steep but I believe it’s totally worth it based on the results I’ve seen already. Since joining I’ve lost 10lbs, shed body fat and also built muscle mass. They provide a pretty cool InBody machine at each studio to measure all of these things and keep track of your progress.They offer many different time slots throughout the day to meet scheduling needs that every member has access to and the membership carries over to both locations(Irvine & Costa Mesa). This is a HiiT focused workout program that is always fresh and new no matter how long you’ve been attending classes. Every trainer that I have worked with is awesome. They are very motivating and open to teaching you on the spot. Even though it is a group workout class they make it feel very personal every workout.COVID GUIDELINES: They require a mask when entering the building and before you can fully enter they do take your temperature. They also require two towels, one for yourself and one for any equipment you use throughout your workout. Sanitizing spray bottles are provided so that you can wipe down equipment before moving on to the next station of the class.All in all the price is definitely higher than your average gym. But at the 12 you get awesome workout routines provided and explained every day, awesome trainers who are there to help you with whatever your fitness goals are, and a variety of different classes and time slots that are easy to schedule with their very own app.To this day I’m in the best shape I’be ever been in and I couldn’t have done it without the 12!

One of my favorite workouts in the area! Love the variety you get rotating through different stations and the trainers bring great energy. I always feel like Ive gotten a good workout after.

The 12 Irvine has been incredible. The gym is cleanly and neat, the staff is extremely friendly and helpful, and the workouts are tough and always exciting. I signed up in June of this year and have already seen incredible results. I’ve always struggled with being consistent with my works outs but having the structure in the class is why I’ve been able to be more successful!The 12 focuses on HiiT training so the workouts can be pretty intense. However the coaches there just want your best effort so if you are just starting to workout and need some time to build your strength and endurance I would still recommend their classes. The group environment makes it less intimidating and the coaches are motivating throughout the class!If you sign up for membership you get access to every one of the classes they offer, which includes a variety of different start times, 2 separate locations(Costa Mesa & Irvine),Classes are unlimited so me and my husband try To make it a routine to go M-F and just start our day working out!!COVID GUIDLINES:You do have to wear a mask upon entry and take a temperature test.**You do NOT have to wear your mask while you work out // However ever station is adequately spread out so you have enough space.As long as you bring an extra towel to wipe down any equipment that you use you’re all set! AND they provide each member a sanitized spray bottle before each workout.The price is $189/month so it is significantly more than your average gym but I would totally recommend trying it since they offer a free trial class! It’s no pressure to sign up afterwards at all either, but definitely worth going if you also struggle to get creative with your workouts and have a hard time being consistent with them like me! HahaAnd Shoutout to my trainer Uli in the 9AM Mon-Fri slot! He is also a big reason why I’ve enjoyed the 12 so much and why I continue to see results every week!! I’ve worked with Nicole at the 12, and just recently Dana from the Costa Mesa location for yoga on sundays and they’re both incredible!!!

Absolutely love coming here. Ive never been much of a gym-goer. But, my bf got me a free class and Ive been hooked ever since. From encouraging trainers like Coach Maui to a state-of-the-art facility, I wish I could give this gym 12 out of 10! Thanks for getting me on my feet and making my body burn!

This is the best workout I have ever tried! It goes by super fast, the instructors are amazing, the facilities perfect and the Everyone helps each other. If you are looking for a new workout - try the12! You won’t find anything better out there!

The 12 has a great combination of strong leadership that preaches positivity while putting us through strenuous workouts to make me feel better. The team aspect that they provide does a great job of holding us accountable and build a sense of a community at the gym. Nichole is an amazing trainer who Is not only expertly trained, but inspires the class with her own personal journey. The 12 is a great place to workout and a great community to be a part of!

Great facility and staff. Ive never been able to keep to a workout schedule and keep motivation but the trainers and atmosphere here have kept me going for 2 yrs. High Intensity interval training really keeps this fresh and fun. Great workouts. Uniquely focused body part workouts daily. A lot better on the body than CrossFit with similar results.

Absolutely love this place. This is a great place to get a full body workout that is fun and challenging. I am glad I found this place that pushes me to get stronger and do workouts that I’d never would’ve done myself at a regular gym. Alex and Nichole are awesome instructors!

I love the 12 Irvine. Im blown away by the positivity, dedication, and motivation the team puts into helping us get into the best shape. The trainers are amazing and are such a joy. You walk in excited for the workout and walk out of this place with a smile on your face. Thank you 12 Irvine for your unique training experience.

I love lifting weights and HIIT training; however, unless I have a class to go to, I will rarely go to the gym. I thought the 12 would be intimidating at first, and I would not be able to keep up with the other members; yet, the members and instructors are very kind here. No one judges you and the workouts are amazing. I have completed 30 classes thus far and I look forward to the workouts so much that I signed up for the unlimited monthly membership. I already feel better and can tell I am getting stronger.

The 12 is an amazing group training gym! I love all the instructors here at Irvine Mesa. Sarah, Nichole and Alex are all super energetic, motivating, friendly, etc. and all the staff here are so friendly, helpful and personable. I signed up for two free classes and after your first class, you get a choice between getting 10 classes for $99 that expires in 3 months or unlimited for a month for $99. I went with 10 classes because I was traveling soon. Once I came back I finished my 10 classes in 3 weeks! I was hooked! So I signed up for their unlimited membership which is $179 per month. I dont like going to the gym so going to the 12 helps me a lot and Ive been coming here for two months and I already see results!I love the 12! :)

I love the12! This is a great full body workout with a motivating and team filled atmosphere. Nichole is one of the best trainers I have come across and to top it off she is witty! I love starting off my days with the12 crew!

I discovered the 12 a few months ago and was hooked the first day! Not only do I love the workouts but the environment truly makes it! All of the trainers are super encouraging and uplifting and make me actually crave going to workout! I also love the community focus The 12 has! I meet a new person every time I go which makes it even more fun. If you haven’t checked this place out yet you totally should!!

Really enjoy coming to this studio. The staff is friendly, studio is clean, and the workouts are awesome. I always leave feeling GREAT!

Loving this gym and community so far! I did the free 2 sessions and now I am one week into the $99 intro unlimited monthly offer. At the gym they have a body fat scanner so you can track your progress. Hoping to lower my body fat percentage by the end of the month.

I have tried plenty of gyms in my life and The 12 has been the best so far! The workouts are intense, yet safe and very effective. I am always looking forward to the classes, especially under the guidance of Nichole! Her enthusiasm and encouragement has always motivated me. Come check it out! You will be hooked!

I love the facility, spacious and clean. Group classes are motivating and the instructors do a great job in pushing us! Friendly staff and instructors too!

Have been going to The 12 for about a month.. Absolutely love the energy of the classes and the momentum they fuel me with. Highly recommend!

This is a great facility! They have such a welcoming environment, and supportive team. This place has literally everything you need to get your workout in during the day. I love that the workouts are different everyday, and they offer so many class times. Great HIIT training!

I absolutely love coming to The 12! The encouragement and support from the trainers and members is amazing.The members have a wide variety of fitness levels from out of shape people to people that are in incredible shape.The classes are tough, but I always come away feeling energized and looking forward to the next class.Sarah Gillette, you are amazing!

The 12 is amazzzing. The best workouts and the best coaches. I’ve really been enjoying my first month and plan on renewing my membership as soon as it’s up.

The 12 Irvine Mesa is amazing. Alex and Nichole are both very professional and enthusiastic. I really love their class design, clean workout place and stretch session after each workout!

The 12 is a great workout. Very challenging but you can modify and take it at your own place. They really create a fun and team workout.

I’ve been going to classes at the 12 for a bit now and I love the energy and motivation that you get each class. The instructors really want to get to know you and help you grow. The workouts are challenging but also adaptable for each level

I have loved going to the 12. They have convenient locations, great class times, clean facilities, and great energy in the classes. I go to the Irvine Mesa location- Nichol and Alex are AWESOME.

Love this place. The community is amazing, the workouts are challenging, and I always end up having a lot of fun. Each day works out a different muscle group as not to overly burn out your body. Ive been coming here for 2 years almost daily and have noticed everyday tasks are easier due to the fitness The 12 has prepared me for.

My sister told me about this place and I decided to try it out. I love trying new gyms. And believe me, I am so glad I did! Classes are amazing and the great energy from the trainers to keep you going. Your first two classes are free and I enjoyed it sooooo much they got with me the first month for $99 and I dont regret it. Im LOVING IT!!!!

I just started with The 12 a little over a month ago and I am loving it! The coaches have been really cool and helpful. They encourage me not to give up and to give my best so I can feel and be my best. I am seeing the results and feeling great about it!

Great community, great coaches! The workouts are killer and designed very well. They are really targeting different things every day and youre getting great value.

The trainer Alex was friendly and personal. He took the time to go over exercises I was confused on and has a positive attitude throughout the whole workout. The workout was also intense and I felt accomplished afterwards.

If you are looking for a place where you can meet instructors that care for you or people to help motivate you to go to the gym, The12 is the place to go! I have gone everyday for over a month because I have people who I met there that encourages me to go. I recommend taking Nicoles class because she will make an EFFORT to know your name, DAY 1, and will help you correct your form.

I love this gym. There are group classes available in mornings and evenings - to fit your schedule - and the trainers are great. Highly recommend

Such a great workout! Nicole keeps you focused and pushes you throughout the whole class

I absolutely love everything about the 12! The facility it spacious and clean, classes are so much fun and the trainers are very motivating and knowledgeable. Thank you for all the great energy every time I go to class!

Indeed, any reputation I have for physical fitness this summer stems, in truth, from the extraordinary guidance Nichole Ormsby, Sarah Gillette, and the rest of The 12 team so selflessly provide. I know I speak for many of my fellow gym-mates as well when I say we are grateful to be a part of this family, and we have a lifetime ahead to prove that. This gym not only enables you to gain healthy habits, but mad respect.

All of the staff is so friendly and know exactly who you are! That’s rare to see. Everyone seems to care about you as a person and your fitness needs. The facility is really nice and clean and state of the art equipment. I am definitely going to keep coming back!

I have been going to the 12 for a couple of weeks now and not only are the workouts fun, you see results very quickly. The trainers treat you like family and it is a very comfortable environment. I have already made friends with many people from class and will continue going to this gym!

These guys have created an amazing community around fitness, health, and well being. I can not sing their praises enough! They keep you accountable through getting to know you, and are not afraid to call you out to push you to greatness!

I cant say enough great things about The 12. The workouts are always new and exciting, so theres no way youll ever get bored. Im an avid long runner, so this is the perfect way to cross train and build my strength. In one hour, youll get the best full-body workout that incorporates weights and cardio. The atmosphere and positive community are what keep me coming back again and again. Do yourself a favor and sign up for one of Nichole Ormsbys classes. Guaranteed you wont regret it!

Everyone at the 12 brings positive energy in a way in which you find that extra push to keep going! The trainers are all top notch, expecting you to give your best, and motivating you even when you think you can’t go anymore. Definitely recommend!!!

Really intense HIIT circuit class! Great workout and good team-based structure.

The 12 is a great place to workout. The workouts are always challenging, and the class atmosphere is fun & motivating!

Great workout. Done the gym, crossfit, orange theory etc. The 12 is a perfect blend of it all and the instructors, especially Nichole, are awesome. Try it out, you will not be disappointed.

Love the workouts here! I have done a lot of workouts in my life and this is the first one I have ever been excited to go back to; borderline addicted. I feel pushed yet get to work at my own pace. I always feel accomplished.

Exciting experience working out. I look forward to going to the various boot-camp classes each week. The instructors have been high energy and they really forge a sense of community and teamwork so you push each other during class. The high fives and motivation to keep going even when youre exhausted really help each person get the absolute most out of every workout. Its awesome. A little expensive, but totally worth it.

The 12 is a terrific high-energy workout! The leg/glute days on Sundays and Tuesdays are the bomb.

After being a member of 24 hour fitness for about 11 years, I felt as though I was no longer as motivated and found that I wasnt pushing myself as hard to work out. A friend of mine introduced me to The 12, and I was immediately hooked. The constantly changing workouts, the awesome instructors, and comeraderie within the community keep me motivated and consistently coming back.

Love the entire staff, owners and trainers. Solid philosophy, foundational principles in exercise and the variety you get at every session. Love love love.

As much Id like to rave about this gym after being a loyal and consistent member for 4 months now, they recently put a bad taste in my mouth. Nothing on the trainers (theyre amazing), but their admission policy. I wanted my boyfriend to come and experience the same intensity and awesomeness that Ive been thriving on and I figured why not just do the two complimentary sessions that the website touts, no strings attached. Nowhere does it say you have to be a local to be able to attend on the website or advertisements. Heck, my coworker that works out with me is from LA County, do they deny him membership? Nope. Doesnt make any sense. Would only allow him to put a card on file to let him take a session- only to force him to sign up for a drop in ($25, which is a 1/4 of my monthly membership fee) or buy a package. I feel like we were lied to. Not only did the 12 lose a potential client, but they also lost a loyal client that wont be renewing anymore.EDIT: Josh the manager called me personally and apologized for the miscommunication and amended the situation. Thank you Josh for being such a great owner and taking responsibility of your business and employees.

The 12 is now my go-to gym if Im traveling in OC. The studio is large and clean, their equipment is new and diverse, and the instructors are incredibly motivating. The workouts are structured so that each day they do they same workout throughout the day. Tuesday might focus on legs, Wednesday on back and shoulders, etc. I heard some people double-up on classes, but that seems crazy to me because these workouts are TOUGH! They really push you and will make you break a sweat, but the classes go by fast and are a lot of fun. (If you like getting your butt kicked that is!) I would describe the place as intense, but I personally feed off of that. If you come to class with a can-do attitude, you WILL succeed and transform your cardiovascular health and body.Class sizes vary tremendously. A 5 or 6pm class could have 40 people and a 10am class could have 4! Crazy.So yah... I recommend to anyone even remotely curious to at least try it out. They offer 3 free classes to new clients! No catch!

Incredible hour! Kicks your @$$ but you’re so engaged you don’t realize it until it’s over (or till the next day)!!

Such an incredible class! I love that I found my new tribe! Thank you Alex!!!

I have been coming for three weeks and this is one of the greatest decisions I have made going into the new year! The people within this community are so supportive and kind, the workouts are challenging and are really productive to my new strengthening goals!

Always a fun time here at the 12 - Irvine Mesa. The trainers a really knowledgeable and can help you reach your fitness goals. Also, shoutout to Amandie at front desk for helping me get set up. #12nation

The 12 is a real friendly place! Grueling workouts and good times! Nicole and Alex are da bomb! Show up ready to get shredded !

Love all the classes at The 12. All the trainers are amazing and it’s always such a great workout!!

Motivating atmosphere that makes working out so enjoyable! All of the trainers are wonderful and each day of the week is filled with different exercises that focus on specific body parts (ex: Tuesday- legs, Friday- cardio). Definitely recommend checking out The 12 if youre looking for a gym in the OC, especially since they offer the first two classes free.

Excellent workouts configured to target specific muscle groups, utilizing a variety of resistance implements. The trainers are knowledgeable, encouraging, and make putting in the hard work a fun experience!

Amazing workout! A great group fitness facility. The instructors kick ass!

What a great way to work out. Fast paced and fun. Madie was a driving force - kept me going when it would have been easy (my first class) to stop mid exercise or mid clas.

Always a great workout and the trainers have a good attitude and positivity. They push you and support you towards your goals.

I come here with my boyfriend because she is a member, and she can bring a guest for free any time. This place has great customer service, and the place is always spotless.

Maddie is the shiz. All the trainers here are a lot of fun and keep you driven while making sure to correct your form.

Love the facilty and the trainers. Im obsessed with The12!

What can I say about this place? Wow! I just finished my 5th session this month and simply love the place. The instructors are just great, full of energy, while always supporting everyone with smile, encouragement and more. The place is just great and I even like it better than Crossfit with far less chances of injury even though you workout every muscle group. Thanks to Cyrus and Hailey Marie for introducing me to this place. The best reasons to come here are: a) pure energy b) you can be in great shape or in horrible shape - the workouts work for everyone c) peer group - just make it to the door - the rest will take care of itself being surrounded by amazing group of peers d) awesome instructors e) you will experience exercises that you never have in your life in traditional gyms - all good and motivating f) Do this a few times a week, eat well, and you will be in the greatest shape of your life in no time... I would give it a 6 star if such option existed..... :-)

Before coming to this gym I was in a three year long depression. from going to jail to bindge drinking. But I made the choice to change. And from the first minute I walked in here my life has been nothing but greatness. If you have the drive to do HIIT workouts The 12 is for you. You will feel welcomed like family. And if your in class with me I will motivate you becuase thats how we do it here at the 12!!!!

Great trainers, great work outs, great environment.

Love coming to workout here! The coaches here are motivating and inspiring!

The 12 is above the rest with their pure dedication. Their classes, training and equipment are spectacular.

I love the atmosphere and trainers!!! The music is fun and everyone is so nice!

Excellent workout, excellent trainers, facility is new and always improving

Killer workout. Cool people

Great workout!!!!! Stephanie is a Bad A$$ Trainer too! :)