Bottom Line Up Front: I give this gym 5 out of 5 stars --…read moreand that says a lot because I've been training in martial arts since 1995 and am a certified instructor in multiple systems. But let me break it down as to why it gets my seal of approval. What You'll Learn: Rounders offers multiple martial arts: Boxing, Muay Thai (kickboxing), Brazilian Jiu-Jitsu, Kali (a Filipino knife-fighting system), and Mixed Martial Arts (which combines striking, wrestling, and Jiu-Jitsu). In the past they have also offered wrestling and Judo. So there's something for everyone. Regardless of what class you pick, you'll learn how to protect yourself while getting a great workout. What You'll Gain: Like I mentioned, you'll get a killer workout in a safe and fun environment. According to some studies, you could burn anywhere between 300 to 800 calories in a single 1-hour kickboxing class. It's far more efficient (and fun!) than running on a treadmill. And the added bonus is that you'll learn self-defense along the way. Who You'll Meet: From co-owner Joe Kim to all the other instructors, the coaches here are physically talented, knowledgeable, and easy-going despite being deadly warriors. They create a positive atmosphere so that everyone -- from brand new rookies to combat sports veterans -- has fun while learning. And that trickles down through to the students, who are all supportive and welcoming. The Space: The gym is medium-ish in size compared to other gyms in the area; enough to hold one large group or two smaller sessions at the same time. The equipment is top notch. And the workout space is well maintained. There's also a small section for weight training, too. The Cost: I've visited other gyms with outrageous prices (like $200 a month for only Jiu-Jitsu!). Fortunately, tuition here is reasonably priced -- with options to drop-in, go month-to-month, or commit to 6 months or a full year. (The latter two doesn't mean you have to pay upfront, just that you'll be charged automatically for your chosen time frame and save more over the long term.) And considering those options give you unlimited classes for all of the martial arts classes, Rounders is totally worth it. Conclusion: Rounders MMA Fullerton is an ideal gym to join, whether you're looking to lose weight, learn some self-defense, or just belong to a cool community who will encourage and grow with you.

Took my son here for a free trial and everyone was so nice and friendly. The lady at the front…read morewrapped his hands and made him feel super comfortable. Coach Steven was amazing and the class was amazing! Excited for my son to start boxing!!

I didn't even think I liked boxing when I first walked in (tbh, I didn't have gloves for that first…read moreclass ) but here I am almost 2 years later. The classes give variety throughout the week, with a balance of cardio and weight training, and the booty classes are 10/10. 6pm class over 6am any day though!

We signed our 8 year old up for the youth classes. Best decision we've made for him. Kadeem & Eric…read more(coaches) are BAD ASS!!!! The classes are upbeat, enthusiastic, energetic and so much more. The facility is very nice, very clean and a super inviting environment. The older kids are so helpful and patient with my son. Some of the most respectful kids I've seen. I believe it's because of the energy and amazing vibes, structure and impact that these coaches exemplify. The only bad thing I have to say is that I waited too long to sign my son up. Looking forward to a long boxing life here at KS FITNESS!!!!

The trainers are great. The gym is very welcoming to everyone! Hours and workouts are perfect for…read moremy needs as a full time mom. 30 minutes is usually all I can fit in and I get a great sweat. Every station is created to be intense, so what you put into it you will get out a workout that makes you feel accomplished and ready for the day. The owner and trainers really do care about you as an individual and want you to succeed. They offer workshops that sharpen your skills and teach you how to get the most out of your workout with the proper technique. Highly recommend, definitely for those with time constraints, want a great sweat and those looking for a community who will be happy to see you and see your progress.

Love coming to this gym, I've been going for almost two years. With no class times, I'm able to…read moredrop in at any time so it fits super well into my schedule and prevents me from coming up with excuses to not show up. All the trainers are super attentive to the members making sure our form is good for exercises and providing mittwork during every workout. Love all the trainers, but especially Bianca and Silvia who always know how much to push me. Although I go almost everyday, it always feels fun and challenging in a good way since the workouts change every time you come in. 9Rounds been a great way for me to relive stress from the day! I always leaving in a better mood especially on days where I'm tired and don't want to workout. One thing is, be prepared to sweat!!

I should've left a review for this gym sooner (also this a bit of an accountability review since…read moreI've been less consistent with going hahaha), but there's a reason for so many positive reviews. I've casually tried other Muay Thai gyms in the past, but they often suggested bag classes for women. Here you can choose from a variety of classes and there's an emphasis on both getting a good workout and learning the form of each movement. As a person with massive social anxiety because I'm definitely not a fast learner, I'm always worried when doing group classes and partner drills that I'm slowing people down. However, I've never taken a class here where I've felt judged by anyone. Everyone from the coaches to the other students are always super supportive and encouraging. There's a culture of students helping each other while coaches make sure everyone of all skill levels is being challenged. You also have the option of doing private training. If you're curious at all, try the intro session and I promise you that you won't regret at least trying.

Update! After a year it has been a great experience. From the members of the gym to the dedication…read moreof the coaches even after a year you still get the same guidance and encouragement as a person showing up on the first day Iv never once felt unwelcome or uncomfortable. I strongly suggest anyone who's reading this review to take the class and sign up and if you are able to commit to a year, do it, there are no other programs out there that offer this type is schedule and genuine value.

We've had such a great experience at POI !!!The coaches are knowledgeable, patient, and truly care…read moreabout helping each child grow--not just in their jiu-jitsu skills, but also in confidence, discipline, and respect. Our two boys look forward to every class and has improved so much since joining. The instructors take the time to encourage each student, and the environment is welcoming and supportive for kids of all skill levels. The gym is clean, well-organized, and has a great sense of community. We're so grateful to have found a place where our boys are challenged, motivated, and having fun at the same time. We highly recommend this gym to any family looking for an outstanding kids' jiu-jitsu program!

Our oldest daughter, now 9, has been at POI for about 3 years now. She started out in the Mini…read moreImpact class because she was hesitant. She quickly progressed to the Team Impact MMA class and in 2024, after building confidence with the help of her coaches and teammates, she finally tried BJJ! She now competes and has multiple medals under her belt. Coach Kaitlynn, Coach Byron, Coach Reggie and Coach Junior are all amazing in their instruction in keeping it focused and fun! Their dedication of countless hours with the kids, especially on competition days, does not go unnoticed. The community we have found have become family. If you are looking for a MMA/BJJ gym for your kid, look no further than POI! A bonus is how clean the gym is!

This is a fantastic gym. If you're looking for real, authentic Muay Thai, from Thailand... this is…read morethe spot. Both coaches I worked with are tremendous communicators, and have an eye for detail I haven't found in other gyms. I learned more in a week here than months of other gyms in the oc area. The other members are great too - no ego, no bullshit here. Just a bunch of friendly people who enjoy kicking, punching, knees, and elbows. Come join us and become dangerous!

Coaches here are nice and dedicated I have a great experience at this gym everyone is helping each…read moreother and I really like it

I discovered KBXC through class pass. After my first class, I decided to try their 1 week trial…read more(with FREE gloves). Dropped class pass and got KBXC membership right away! I tend to try things and not going back, but KBXC classes kept me going! I always look forward for my next class. It helped lock it with my fitness journey! Something that I was never persistent about. Now, I've been working out 5 times a week for the past 2 months. During my first week, I could barely catch my breath and had little knowledge of kickboxing moves and techniques but these didn't discourage me from keep trying. The classes start with intense fitness workout and then focus on kickboxing combos. I highly recommend everyone to sign up for their 1 week trial. This will help you find the trainer that best fits you and your fitness goal. They have multiple locations (Orange, Downey, Lakewood) with diverse qualified trainers. I enjoy taking Jazzmine's classes when I need someone uplifting that encourages me throughout the workout. I take Brianna's classes when I need intense combos and lower body workouts and if you are looking for technique and form, definitely take Kevin and Josh's classes! Your environment and the people you surround yourself with have a big influence on your mindset, energy, and success. This definitely applies to KBXC! Thank you to all the trainers for your hard work! Sable

I've been part of this kickboxing club for about a year and a half, and it's become one of my…read morefavorite parts of the week. The coaches are supportive, motivating, and full of energy. Jazzmine is always a standout, but I've also had great experiences with Eric, Josh, Michael, Derrick, and Briana. Each coach brings their own strengths and teaching style, and together they help you grow in ways you can feel. It's an intimate, friendly environment, and everyone is genuinely nice. I've never walked out with anything but good energy. I look forward to every class, even on the days I'm dragging. This place has become a highlight of my routine, and I can't recommend it enough.

I've been going to FIT Brea since last year and it's been an amazing experience. Andrew and the…read morecoaches design workouts that are challenging, well programmed, and never repetitive. The environment is supportive, and the programming is perfect for people of all ages and fitness levels. The workouts push you to become a better version of yourself. If you're serious about reaching your fitness goals, I highly recommend checking out FIT Brea.

I'm so thankful I found FIT Brea! Over the past several years that I've lived in the area, I've…read morebeen a part of various gyms (both chain and boutique) nearby. Having now experienced FIT Brea, I'm definitely kicking myself for not trying this gym out sooner. I've only done their group fitness classes so far, which range from 8-12ish people in size, and I'm looking forward to trying out the personal training sessions when my schedule opens up! Here are a few ways that make FIT Brea a standout: COACHING: The coaches here are the whole package! 1. They all have stellar credentials, with many of them holding advance degrees and multiple certifications. In short, they know their stuff. 2. At the risk of sounding facetious, I just want to make the point that the FIT Brea coaches actually coach. It might sound like a no-brainer, but it hasn't always been my experience that coaches do much more beyond demo-ing the moves and saying "good job" or "keep going" every few minutes, especially in a group class setting. Here, the coaches constantly move throughout the room to offer individualized pointers on form, differentiated movements depending on individual strength and mobility, alternative movements for injuries, and encouragement and motivation to keep pushing so I can get better and better. 3. They are all super patient, encouraging, and welcoming! PROGRAMMING: The programming for the group classes are thoughtfully and methodically designed. From what I can tell so far, the workouts are structured in mesocycles with a progressive overload pattern. This is important because if we do the same thing over and over, our bodies will adapt and we will not make appreciable gains over time. With progressive overload, our bodies are constantly challenged so that we can keep increasing strength and improving hypertrophy. COMMUNITY: The FIT Brea community is so nice and helpful. I felt welcomed by the coaches and the other patrons from day one. Several people who recognized that I was new introduced themselves and helped me find and set up various equipment. Others even put my plates and dumbbells back during transitions. Just last week, the whole class broke out into spontaneous applause and cheer when I pushed out that last rep of bench press, haha! The mutually encouraging environment really underpins the whole vibe and experience here. It's a special thing. MANAGEMENT: One of the things that I didn't realize would make a difference in my overall gym experience is having direct access to management/owner. In my past gym experiences, the questions/concerns I had would typically have to go up a chain of command before I got a response. Since FIT Brea is owner-operated, the patrons can directly talk to Andrew, the owner, who is so nice and provides exceptional customer service. SPACE/EQUIPMEMENT: It's spacious, well-maintained, clean, and an overall pleasant environment to train in. CLASS OFFERINGS: I'm a busy mom who works full-time hours plus daily commute. I'm thankful that classes are offered as early as 5am and as late as 6:30pm so that I can get my training time in! If you are looking for a gym where you can optimize and maximize your fitness goals (whatever they are), look no further because FIT Brea is it! I'm a serial Yelp sleuther and almost never write reviews, but my experience thus far has so far exceeded my expectations that I felt compelled to share this gem of a place with others!