I've been coming to the 12 for the past two months. I am a workout queen and love to take classes, I've tried most all of the popular workouts in Newport. My biggest complaint is the people and even teachers were not warm or friendly. There is classes that I went to consistently for months and the teacher would never even say hi to me! A lot of the local Orange County classes are also really expensive- around $25 a session! I love the 12 because everyone including the instructors are super friendly and we all encourage each other. The music is super fun and the hour goes by really fast. The workouts are never the same. Plus the price is right and the gym and class room are always clean. Score! read more

Beast Mode! The 12 is an amazing experience from the moment you first step foot inside. Everyone there, staff and members, are welcoming and engaging. The trainers are all so motivating and really push you do be your best. There is no doubt that it is hard to get myself to the gym sometimes, but even when I am not feeling up to it I push myself to go because I always feel amazing afterwards. The entire staff does a great job to put together new and exciting workouts for every class. Just like everyone says, these classes will kick your butt! Looking forward to continually improving on my health and fitness with everyone here. Thanks to everyone at The 12 for being so awesome! read more

Absolutely love The 12! Started my journey to become a healthier, happier better version of my self last June, and I haven't looked back since. The sense of community this place gives its patrons is priceless. I've gained friendships and confidence every step of the way! If you're not sure if the 12 is right for you. Give it a go and check them out :) They offer the first 2 classes complimentary *for locals only. read more

I've been coming to the 12 for about 3 months now and am absolutely addicted! I was admittedly intimidated in the beginning, but the team makes you feel super comfortable and keep you wanting more. I can honestly say I look forward to class at the 12 everyday. Added plus: it is super clean! I mostly take Sarah Gillette's class, but have had nothing but great experiences with every other trainer I've had. Sarah has a great attitude and injects a ton of energy into each class. You get an insane workout and have a blast doing it! Best part is the first two classes are free and the packages are incredibly reasonable compared to other fitness facilities. Would definitely recommend to anyone that is looking for a killer workout and great atmosphere! read more

The 12 is a great training experience, best in the biz. Trainer Matt "Serg" helps you get the best out of yourself. Thanks for the motivation 12! read more

I've been coming here for 6 months now and I couldn't be happier with the trainers, staff, facility, and workout. The trainers keep you motivated, the staff is always friendly, the facility is always clean, and the workouts are always fun. I highly recommend for all skill levels since you can go at your own pace. They have a free 2 session trial so you can see for yourself. read more

Best decision I have made about working out! Always a good workout! I have already seen changes in my body. Not to mention the staff and instructors are the best!! Sarah is so motivational and helpful. You will never be judged and is for all levels. Must try. read more

The 12 is My favorite gym in the entire world. Amazing workouts and trainers. Doesn't compare to any other gym, worth the money and the time. read more

I've been coming to the group classes at The 12 for over 3 years and I have never found another gym with a community as great as this. The first class I ever took was with Jared and he is the absolute best. ALL the trainers here are awesome though! They are all funny and genuinely care about making sure everyone gets a good workout and has a good time. You will definitely get out of it what you put in, so if you come in with good energy and eager to train then this place will be perfect for you and you will have a great time! Kathy at the front desk is so sweet and she is always there in the early morning to welcome you with a smile! I'm so happy that The 12 cared about their community and students so much that they stayed open and changed their entire set-up and moved it outdoors just so we can keep training together. They maintain excellent sanitation protocols and I always feel safe going there. read more

Haven't gone to another gym since I joined this one. Best staff and equipment in OC. I've gone from 178lbs and 16% to 195lbs and 7% following proper nutrition and workouts !! The vibe is like no other gym I've been to read more

The fastest, easiest membership process I have EVER experienced. The gym is nice, it has all the machine/equipment I need - they have a ton a classes but I haven't taken any. read more

I've been going to the afterburn classes for about almost 2 years now and they are awesome! The workouts change each week so you're never on a plateau. The trainers are also incredibly inspiring and push you to reach your goals. Even though it's a group class, each trainer will go around and correct your form if they see you doing an exercise incorrectly. I like the comradery feel of the group classes. Everyone is so nice and welcoming! I usually take Sarah's 6:30 pm classes. It's great how they have classes through out the day to accommodate people's schedule. I leave each classes feeling tired yet accomplished of the workout I just completed. I would highly recommend the afterburn classes to anyone from beginner to intermediate fitness levels. read more

I've been doing afterburn classes for almost a year and I'm consistently improving. I actually have a nice gym at home but I stopped using it because I just don't push myself as hard as I do at the 12. A high energy workout with solid trainers. Always a fresh and intense workout. Love it. Signed up for unlimited and canceled my workout membership with a different group training gym. The 12 is my only workout! read more

This place has become a home away from home for me. I was looking to switch up my gym routine for a while and after a friend suggested checking out their 5am Afterburn classes. I quickly found myself addicted! The trainers are all very knowledgeable, hands on, kind hearted people. Just there because they love what they do and they get joy out of helping people achieve their fitness goals. They've also found a perfect balance between pushing each client but allowing their growth at their own speed. There is an overall sense of community at the 12 and I'm happy to be apart of it. I'll keep attending as long as possible. read more

The 12 is the place to be! The second I walked in the door my perception of what a gym and workout was suppose to look like hanged. Everyone from the staff to the clients encourage you to be the best version of yourself that follows you through out the day. This gym is for everyone young, old, fit, out of shape..... Trainers are willing to help you modify your workouts that match your level so you don't feel intimidated. I have taken personal training with Lindi and she's phenomenal! She's not afraid to challenge you and shut down the self defeating thoughts we all have. All the trainers are very knowledgeable and helpful and become like a family. read more

Sarah Gillette and the team at the 12 offers one of the most inclusive and well rounded programs I have ever attended. I am now a member and will continue to be indefinitely and made the decision only after one class. Her classes are a staple in my workout routine now. As a former Marine and competitive athlete who still runs Spartan races and mudders I can tell you no one will walk away from her class without learning a handful of new techniques and tricks to improve your workouts. read more

Love it here! Chad is awesome, seriously the best trainer. He's always happy and positive. He customizes a meal plan and amazing workouts that pushes you. I've never felt better! read more

If it wasn't for this place I wouldn't be where i am today it changed my life for the best! I use to go to 24 and hated it there's nothing worse than trying to get back into the gym and feeling like you don't belong, but not here at the 12 at all , everyone is there for the right reason and willing to help anyone. I have been training with Kye for the past few months and it is the best thing I have ever done for my self he is awesome even when we're not in a session he's always there for whatever I need. I highly recommend this place! read more

One of the best one hour workouts. The staff and coaches are very friendly and motivating and inspiring. Sarah is one of the most funnest coaches I've ever met. read more

Ive been working-out at the 12 for the past three years and Ive really seen a change in my body. They are mainly group classes and then you can pay extra to use the gym or work with a personal trainer. I like the classes because they are quick and get the job done. The best teachers are sarah and tricia! The 12 is pretty expensive just like the other specialty gyms in the area but they often have deals and they do student discounts which is perfect for a broke/poor grad student. read more

I haven't taken the boot camp classes. They look pretty intense, though. The gym itself is sort of a rare gem. It skips a lot of the frills but has some great equipment you might night find other places (two jacob's ladders, two rowing machines, tread climbers, etc.). The facilities are fairly nice and any faulty equipment is replaced quickly. Membership is $40 a month with no sign up fee, which I liked for a summer workout place (though I've decided to stay on because I like the place so much). I usually go between 6:30-8:30 AM and 6:30-8:00 PM, and I have never had trouble finding spots or even super-setting and using two different pieces of equipment simultaneously. Upstairs they have a state-of-the-art biometric scale / fitness tracker that tracks and can send you information, if you so desire. The staff are all friendly and attentive to the needs of the members. The owners / managers are always present and ready to help with any concerns. The people there are serious about fitness, but they are all friendly and you can learn quite a bit from eavesdropping on the many trainers here. I worked out with trainer Alan Lane for a while, and he was excellent. He helped design tough workouts despite my torn meniscus. The only thing I don't like about this place is the hours. As a father of two, I sometimes struggle to get into the gym before 7:30, and the place closes at 9:00PM on weekdays and at 5:00 PM on weekends. Still, I highly recommend this place. read more

I cannot express enough how great this gym is!!! The equipment is great quality and always clean. The community is out of this world awesome. You will meet some of the most amazing, hardworking and friendly people in town. Everyone is extremely supportive and want to see everyone else achieving their goals in the gym and out. The trainers are super knowledgeable and the results show with their clients. If you want to transform your body and surround yourself with some of the best, then this is definitely the place for you. I couldn't be happier on all levels. Plus is is rarely too crowded so you can get in a great workout at any time of day. A huge deal being in OC. read more

David Prizer is a great Personal Trainer. He is so dedicated and committed to my success. I learn something new every time I work with him. The combination of his training tips and nutritional direction has transformed my workouts and my results. He has the perfect balance of pushing me past my limits and encouraging me to succeed. Plus, he is funny - great personality. read more

I have been working with David Prizer for the past 3 months. He is an amazing trainer and has a great wealth of knowledge in weight training, food management and how each component feeds off of the other. He's always on time, great enthusiasm and pushes me to be the strongest that I can possibly be. I look forward to reaching my goals and have no doubt that with Dave's help I will get there!! read more

Been coming to 12 for two years and this place truly deserves five stars. The afterburn classes target every part of your body and the different concentrations everyday gives great incentive to keep coming all the time. They also have state of the art equipment to measure your body fat and keep you on track for a healthy fitness lifestyle! read more

Usually I only write reviews for restaurants, but I couldn't help myself! I've tried so many gyms, ranging from 24 hour fitness, LA Fitness, Crunch, to Equinox, but I have to say I absolutely love The 12 gym and community! The classes that the 12 offers focuses on engaging the entire body which I love! The classes offered are high energy, motivating, and group oriented which creates accountability and encouragement. I love that it's intimate without being over crowded and still has great equipment for members! I guarantee you won't be disappointed with a membership with the 12! read more

The 12 is the best gym in the OC. The staff and members are friendly and kind. great place

LoViNg this gym!!!!!. I'm enjoying everything about my 615am workouts here. The class energy motivates me, everyone is friendly, encouraging and competitive... I can't get enough. The best part is Amy Green!! I just adore her. She makes me want to come to class everyday and I probably would if she taught at Costa Mesa daily. I'm very happy to be apart of the 12. It's definitely worth checking out. Best sweat of your life. read more

I can't say enough about The 12 Afterburn classes. I totally feel like I have gotten stronger. Doing a simple plank was difficult when I first started and now I actually have more core strength, and my hubby said my butt is tighter :) Totally see results and I've only been 23 times. Just bought another package. I've only been to Brittney's and Sarah's classes and these trainers are amazing. The music pumps up the room and there is a lot of energy. I LOVE THE 12!!! read more

I was introduced to The 12 through Classpass and immediately loved it! I ended up moving to a different gym to be close to my new job as the 5:00am was the only time that would work with my schedule. After countless frustrating experiences and missing The 12 Life... I quickly came back! I love Matt's 5:00am, his enthusiasm and knowledge is instrumental in the success of my workouts. The class is never full, unlike other gyms I have dealt with, and registration is easy! The variety of exercises keep me interested and engaged, completely oblivious of the 60 min time frame. The only issue I had was that, to my knowledge, I was unable to find specifics regarding the amenities on the website which is important to me bc I shower and get ready for work after class. The locker room is spacious and clean with 38 lockers at your disposal. The 4 showers are never full and are always stocked with shampoo, conditioner and body wash. Hair dryers are available along with body lotion and mouth wash making my work prep a breeze. Love my gym!! read more

See all

I am a newer member here, probably about 3 months now and I can't say enough amazing things about the trainers here! I consistently take Sarge's class and have taken most other instructors classes and they all are truly amazing and dedicated to fitness and health. I have numerous health issues as well as injuries and have either modified some exercises or pushed through them. I find their classes are extremely challenging and see the changes in my body in just the few months of coming here. It amazes me how super outgoing and friendly all the staff is here from the front desk to the trainers and even our workout partners. Found my new gym home. Thank you everyone! So it's been a year now and this places rocks! My body has changed drastically. The trainers here are so dedicated to their careers and in building great members. No gym compares! read more

Wow! I've been going to The 12 - Costa Mesa the past 6 months and absolutely love it! I have always been against going to a gym because it was just too boring for me, but I finally found something that is not only fun...but it works! The interval training it perfect for me and is a full body workout. We're always doing new exercises and targeting different muscles throughout the course of the week. This is just what I needed to bring me to that next level I was always struggling getting to with my fitness goals. Every class continues to challenge me and I can definitely see the difference and have a much more toned body now. And lastly...the trainers rock!!! They are all so motivating and encourage teamwork, so it's a great place to make friends too! read more

January 28, 2015 was my first class at The 12; I was convinced by a dear friend, Stephanie Selinske, that The 12 was what I needed to do! I went into it without knowing a thing about what to expect. As a former athlete, (water polo, football, softball, soccer, etc.) I thought I knew how to "workout"! After my first class, at that time, "Compound Cardio Kaos", I puked! And I was hooked! One year later, my life has changed! At 46 years old, I feel stronger than ever, and absolutely love the camaraderie and inspiration I get out of these classes 4-6 times a week! Since Jan 2015, we've added 4 more people from our workplace to the 5:00AM workout crew, and developed invaluable relationships with classmates, instructors and the owners; all of whom couldn't be nicer, more inspirational people! The 12 is a life changer...I'm down 20 lbs, reduced body fat by 8%, and am stronger than ever! All thanks to my favorite people at The 12! On this, my first anniversary with The 12, I would like to thank you (The 12) from the bottom of my now highly functioning heart! read more

Best workout experience! The have made me addicted to fitness. Everyone is amazing and all the trainers are always willing and excited to help you achieve your goals. Love these beautiful people and can't imagine fitness without them! read more

I started going here through ClassPass and I loved it SO much that i bought a package! As a female sometimes it can be intimidating to go to a workout like this - but ladies, don't worry - no intimidation! Not only are all the trainers super friendly and welcoming - so is everyone else! It's an amazing workout, that is high energy, fun and goes by SUPER fast! Both the Irvine and Costa Mesa are amazing - but i go to Costa Mesa more often because of convenience. Give the 12 a shot - you won't regret it! I have always worked out regularly, between hot yoga and spin - but just in a few weeks of working out at the 12 - I've already noticed how much stronger I am! I am hooked! =) read more

If you're thinking about giving HIIT style training a try this is the place to do it. The classes are full of variety and very thoughtful and fun trainers who encourage you through the 60 minute Afterburn session to push your limits and change your body. You are guaranteed to get as much as you give at the 12. read more

I love the 12! It's a high intensity, high energy work out. I go to both locations (Irvine and Costa Mesa). The trainers are so motivating and so fun! They make the workouts go by so fast! Matt, Tricia and Amy are by far my faves! If you take one of their classes, you will not be disappointed! As a matter of fact, you'll be addicted! I highly highly recommend the 12! read more

What I love about this gym is the personal training from Dave Prizer has been on point. He has Great work out routines and is right there motivating and supportive every second. He is also really knowledgeable when it comes to fitness, personal training and health. It has made such a difference in my life already! As a beginner at working out and the gym and barely knowing any exercises Dave trained me in a way that made me feel confident about exercising and being at the gym both with a trainer as well as alone. I am so amazed at the confidence I have gained. So any questions you have about exercise, diet or health and nutrition he is the one to ask for sure! read more

Great workouts that never get boring, Great instructors with great attitude, Great music that gets you perfectly pumped up to go Big in your workout! Can't ask for much more. So happy I heard about this place through my girlfriends. read more

I LOVE the 12 Costa Mesa! Matt G. is the best trainer and I love his 5:15 pm and 6:30 pm classes! He's motivating and his workouts are challenging. Could not recommend this place more! read more