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    Fitness Underground

    4.9 (56 reviews)
    Open • Open 24 hours

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    competition style bench/squat racks and plates
    Jonathan J.

    just started coming here with my buddy recently and i don't regret it. they have the best lifting equipment and machines i've seen out of any other gym i've been too in a 30 minute radius. The owner Ian is awesome, he's super cool and chill. the gym is super clean and the community is amazing. you can come in at 6pm and see it for yourself. you'll see people cheering for a random dude hitting his PR. It's a really cool environment.

    Abe S.

    First off, I'm 32 years old. I consider myself pretty knowledgeable when it comes to dieting and working out. Yet, I've struggled for years to stay consistent with both. I've had a LA Fitness membership since 2009. So, I decided to search elsewhere than your typical large gym (e.g., LA Fitness, 24 Hour Fitness) in hopes of finding a solution. I searched for a local gym on Google, and Fitness Underground was the first to pop up. I'll admit, I was hesitant--I was so used to large gyms with every machine possible, even if I knew I would never use them, lol. I found myself scheduling a consultation with Ian, the owner. He's been my personal trainer since January 2024; it's now July 2024. I'll begin by saying Ian has enriched my knowledge of both dieting and working out. He corrected bad lifting habits that I never knew I had, which led to less stress on my body, fewer pains, and fewer injuries. All the "random" shoulder and back pain is no longer random or a mystery to me, but most importantly, a thing of the past. My dieting has improved tremendously since Ian and I started working together. Ian understands that everyone has different eating habits. We took the time to figure out what works best for my lifestyle, and within 6 months, I went from 218 lbs to 188 lbs. My wedding photos look great thanks to Ian and the people at Fitness Underground. Don't get me started on the environment--it's extremely welcoming. Everyone is so friendly and polite. It might come off as intimidating if you're not a powerlifter or someone who squats or deadlifts, but don't be. Everyone is a gentle giant--don't be scared. I can't express my gratitude enough! I highly recommend this place--give it a shot. Before and after photos attached!

    The front of the gym
    Jesse S.

    This is by far one of the best gyms I have experienced. The gym community is great no ego trips everyone is welcoming and will assist you if you need help with anything. They have a great group of personal trainers to help move you forward in your fitness goals. It's not your big commercial gym but they have plenty of equipment to use. it's open 24/7 365 days a year so no days off and no excuses so go sign up now.

    Up coming powerlifting meet
    Sam G.

    Awesome place to train. With amazing staff and community home of the Ugly and Proud Athlete.

    Fitness Underground

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    13 days ago

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    Ian H.

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    Photo of Gabe M.
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    2 months ago

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    Ian H.

    Hey Gabe! Thanks for the review. Glad you had a great experience!

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    3 months ago

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    2 years ago

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    Ian H.

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    1 year ago

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    Ian H.

    Nany, thank you for the review! Keep up the great work!!

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    Photo of Tamarella N.
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    2 years ago

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    Ian H.

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    2 years ago

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    2 years ago

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    Ian H.

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    2 years ago

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    Ian H.

    Gaby, thank you very much! We are happy that you love the gym!

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    2 years ago

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    Ian H.

    Jesse! Keep up the great work! Thank you for the review.

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    1 year ago

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    Ian H.

    Hey Matthew! Thank you for the review!

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    2 years ago

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    2 years ago

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    Ian H.

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    2 years ago

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    Ian H.

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    2 years ago

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    4 years ago

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    2 years ago

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    2 years ago

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    2 years ago

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    Ian H.

    Thank you for the review!! We are so happy to hear of your progress!

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    3 years ago

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    Ian H.

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    2 years ago

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    2 years ago

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    Ian H.

    Haha! Love this. Thanks for the review, Jorge!

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    3 years ago

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    4 years ago

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    4 years ago

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    3 years ago

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    3 years ago

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    4 years ago

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    Ian H.

    Thanks for the review, Sevren! Keep up the good work!

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    5 years ago

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    Ian H.

    Thank you for the review, Bruno!

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    6 years ago

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    9 years ago

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    4 years ago

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    Ian H.

    Thank you, Alex. Keep killing it!

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    4 years ago

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    Ian H.

    Thank you for the review, Amber!

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    3 years ago

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    Ian H.

    Thank you for the review, Henry!

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    8 years ago

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    Page 1 of 2

    Ask the Community - Fitness Underground

    Is Fitness Underground a private gym?

    Yes, Fitness Underground is a private gym, family owned and operated. We cater to individuals who are looking to get away from the overcrowded & larger corporation gyms. We… 

    Hello, does your gym offer small group training?

    We specialize in personal training up to 2 people max.

    How much is a day pass?

    $25

    What are membership prices? I have a gym membership already, but I work out in the evening and they close earlier on weekends.

    Hey Aaron! Our most popular membership is currently $70 per month. This includes 24/7 access to gym. Please just make an appointment for your first visit which can be done through our website. Thank you!

    I would like to ask, for someone who wants to get back into working out, is this gym for me?

    All levels are welcome! If you are a beginner or just get back into it, we highly recommend working with one of our personal trainers. Please fill out the "Contact" form on our website and will set up a time to meet. Thank you.

    Is this facility following covid guidelines?

    View All 11 Questions

    Review Highlights - Fitness Underground

    “I have been personal training with Marisa for a while and I have to say it's been the best experience ever!”

    Mentioned in 10 reviews

    Read more highlights

    6th Sense

    6th Sense

    4.2(28 reviews)
    4.6 mi

    Terrible experience at this neglected gym!…read more I joined this gym on the beginning of this month (April ) and got my membership canceled by the owner 12 days later which I only used the facility 3 days to workout. I have multiple gym memberships from commercial to private gyms and this was a first. I always clean and unload the machines after each use and this day was not a different day. I was approached by the manager of the gym which is the owners brother in a disrespectful way, telling me to rerack the weights from previous machine which I clearly unload the machine, but the gym does lack on weights stations to unload to it, so I left on the side of the machine organized which he told me to put where I got them from, which was from walking around the gym grabbing from machine to machine and I told him that it doesn't make any sense when they lack on stations to drop the weights on it. Although I went back and did what he said. I pay to go there not to work there. 2 minutes later as you see the screenshot, the owner Mario texted me saying it is courtesy but them is rules which is not on the contract anyway. So they canceled my membership when I didn't even left the machines loaded or weights on the floor. Unfortunately this was a act of discrimination from the manager to me as a person as there was one other dude earlier time leaving all weights on the machines and nothing was said. I was going to cancel the membership on Friday due to this gym been neglected for long time. Machines are mostly ripped off , tapped or some broken. Machines are on top of each others or next to the walls with wires or ladders next to or impossible to load them, so many hazards. Bathrooms are dirty and trash all over the place most the time and barely anyone at the gym. Men's locker room is a mini one dirty with broken toilet and main door doesn't even fully close. What you see on IG are all filters and angles, they clearly misleading people, I joined online on their website from social media, as if I add gone see it before in person I wouldn't ever join it.

    Honestly best gym I've ever been a member of, by far the best machines, you can tell the owner…read moreknows his stuff. The layout is a little weird and can feel overcrowded at times but I feel the negative comments on that are a little over blown. The music can also be too loud on some days, to the point where you can't even hear your own music with headphones on but I do appreciate the fact that customers are allowed access to the aux. Another gripe I had, which was a big one considering how much monthly you were paying was that several machines would be out of order on a consistent basis especially in the cardio department, as well as a urinal in the men's restroom. It's been a few months since the last time I was there, so I don't know if that's been resolved by now or not. Owner is a really cool guy and was very responsive to all my inquiries and messages. Main reason I'm not going here anymore is because of a one-off, petty dispute my friend had that was both initiated and escalated by a trainer working there but outside of that, it's arguably the best gym in the ie.

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    6th Sense
    6th Sense - Owner of 6th sense Mia

    Owner of 6th sense Mia

    6th Sense

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    Kacy Performance - Down 35 lbs !

    Kacy Performance

    5.0(86 reviews)
    11.3 mi
    13 years in business
    Free consultations

    By far a great experience to be training with Kacey, after researching online for a trainer who…read morecould help me out with my goals I came across his website. Seeing all the good reviews and results of his clients I was convinced to make a consultation with him and definitely couldn't have made a better Choice. I'm 23 years old never lifted weights and I was a bit nervous going in but he's very professional, patient, and great at communicating with the routines, with your form, and nutrition. I've been training with him for about 3 months now and I'm just so thrilled with the results I was able to loose 7.2 percent of body fat and gained about 3 pounds of muscle. Like I said I've never done weights beforehand and for me it's a great accomplishment, can't wait for future results!

    I originally came in just wanting to fix my form and learn how to lift properly, and that's what…read moreI've been getting. Kacy is big on progression and basically operates under the assumption that you can always go up in weight, which has pushed my strength up (especially hip thrusts and RDLs). It's small group training, which keeps the energy up because everyone's working at the same time. He'll keep you accountable and make sure you finish your sets and there's a decent chance you'll leave with a random nickname you didn't ask for but it does keep things entertaining. In my first month I've already seen measurable changes in strength and body composition, so it's been interesting to see the progress show up pretty quickly. Curious to see what the next couple months look like.

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    Kacy Performance - 8 weeks of dieting. Loss of nearly 7% BF and 20 lbs overall. Total body recomp

    8 weeks of dieting. Loss of nearly 7% BF and 20 lbs overall. Total body recomp

    Kacy Performance - Down 35 lbs and up 7.5 lbs of muscle

    Down 35 lbs and up 7.5 lbs of muscle

    Kacy Performance

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    The Camp Transformation Center - Ontario Ranch

    The Camp Transformation Center - Ontario Ranch

    4.7(56 reviews)
    8.0 mi

    This gym is completely unrecognizable from what it used to be. What once felt like a true community…read morenow feels like a corporate rebrand that forgot the people who built it. The culture has shifted away from the diverse, welcoming vibe that reflected Ontario and into a loud, performative, hyper- bro, heavy metal/rock atmosphere. It's not technically "bro only," but if you're not part of that energy, you're effectively invisible. When new ownership came in, they fired the long-time employees who made the gym feel like home, and since then the environment has become uncomfortable and oddly transactional. The vibe now feels performative rather than genuine. The trainers are loud for the sake of being loud, hyped to an almost cracked-out level that feels disingenuous instead of motivating. The favoritism is impossible to miss. I'm here weekly, and Miguel, the owner, has never once acknowledged my existence. No hello. No nod. No eye contact. Meanwhile, he's fist-bumping the men on either side of me like it's a frat boy reunion. Every. Single. Time. As a woman, it's hard not to see the pattern. He'll happily engage with the conventionally attractive women, but if you're just a normal person trying to work out, you're ignored. If you're not ripped, or radiating alpha energy, you're background noise. It's giving used car salesman confidence with a dash of outdated male chauvinism.. A gym should empower people and make them feel welcome, not dismissed or overlooked. It's genuinely disappointing to watch a once inclusive space push away the very community that made it successful in the first place. P.s. please diversify the music again! We need some reggaton, rap, and EDM... It's missing some Ontario culture.

    The 4 PM class with Autumn definitely caught my attention. I usually work out with my headphones in…read moreand tune everything else out since I'm not in the class, but I forgot my headphones this time, and her energy still came through. The workout itself looked intense and pushed the class to the edge. No one was coasting, and the pace stayed high the entire time. Autumn stayed locked in with her group, motivating and pushing them without letting the energy drop. You could see how much the class fed off her. Her motivation felt real, not forced, and it showed in the effort everyone was giving. Even just watching from the side, it was obvious her energy is unmatched. She's the kind of coach that makes people push harder and stay engaged.

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    The Camp Transformation Center - Ontario Ranch - Awesome fit fam

    Awesome fit fam

    The Camp Transformation Center - Ontario Ranch - Me and hubby at the gym!

    Me and hubby at the gym!

    The Camp Transformation Center - Ontario Ranch

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    Anytime Fitness - They have a dead lifting platform, my favorite piece here.

    Anytime Fitness

    4.6(258 reviews)
    3.1 mi
    Family-owned & operated
    10 years in business

    I want to update my previous review and recognize Joe, the owner of Anytime Fitness in Rancho…read moreCucamonga, for how he handled our situation. We had a frustrating billing issue that resulted in our account being sent to collections, but once Joe became aware of what happened, he personally stepped in and made things right. Joe was extremely apologetic, listened to our concerns, and refunded our money in full. What impressed me most was his willingness to take responsibility and resolve the problem fairly. Mistakes can happen in any business, but the true measure of an owner is how they respond--and Joe handled this with professionalism, integrity, and genuine concern for us as customers. We truly appreciate Joe reaching out and correcting the situation. His response completely changed our experience, and he deserves five stars for standing behind his business and doing the right thing.

    I hardly ever write reviews However I couldn't let this one…read morego without having people read what I experienced at this facility. Please read and post your reviews if this happened to you at this facility. I joined Anytime Fitness during the COVID era because I believed in what the owner, Joe Capote, stood for at the time. He presented himself as someone who genuinely cared about helping people stay healthy when many gyms were closed. His message was about standing up for people's ability to exercise, and that was something I respected. In August 2021, I experienced unexpected health issues and called Joe to cancel my membership. He told me it wasn't a problem and said he would place my account on hold for four months in case I recovered and wanted to return. When the four months ended, I called him again and told him I wasn't able to come back and asked him to cancel my membership. He told me he would take care of it and that I would be welcome back whenever my health improved. Later, I discovered my bank account was being charged again. When I contacted Joe about it, he told me I hadn't canceled my membership properly and refused to reimburse the charges. I have not stepped foot in that gym since August 2021. The charges continued until I ultimately had to close my bank account to stop them. As a father of five and a blue-collar worker, every dollar matters. This experience was incredibly frustrating and disappointing because it was not what I expected based on the conversations we had. If you've had a similar experience with this gym or know someone who has, I'd appreciate hearing from you. You can reach me at ericmckenzie12@yahoo.com. This post reflects my personal experience, and I encourage anyone considering joining to carefully review the cancellation policies, keep copies of all cancellation requests, and monitor their bank statements.

    Photos
    Anytime Fitness - Hitmill X for those of you who like to hike this machine is one of my personal faves

    Hitmill X for those of you who like to hike this machine is one of my personal faves

    Anytime Fitness - Treadmill

    Treadmill

    Anytime Fitness

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    PeachBody Studios

    PeachBody Studios

    5.0(43 reviews)
    7.1 mi

    Long overdue review for Peach Body Studio! I signed up for…read moreone of their programs last year and truly enjoyed my experience. One of the things I loved most was the atmosphere--it's an all-women's studio, which made it feel comfortable, supportive, and never overcrowded or overwhelming. All of the trainers are amazing--encouraging, knowledgeable, and genuinely invested in helping you succeed. I especially appreciated how welcoming everyone was, no matter your fitness level. Unfortunately, I wasn't able to renew my membership due to what I initially thought was a minor walking injury I experienced in June. After an X-ray, my doctor said everything looked fine, so I continued working out at Peach Body with modified exercises. Toward the end of my membership, I even transitioned into personal training sessions with Cheli, which helped me tremendously. I had every intention of rejoining after my six-month membership, but I had a trip to Spain planned. When I returned, my knee still wasn't improving. I ended up seeing a new doctor and, after an MRI in January, found out I had a torn meniscus. Fast forward to February, I underwent meniscus arthroscopy surgery. I'm currently on the road to recovery (still in a full leg brace), but I'm hopeful and looking forward to rejoining Peach Body Studio in a few months once I'm fully healed. Overall, I highly recommend this studio to anyone looking for a supportive, empowering environment with fantastic trainers!

    I've been going to PeachBody Studios for about a year now, and I can honestly say it's been such a…read morepositive experience for me. I actually found PeachBody after having a really bad experience at a previous gym, so I was a bit hesitant at first. But from the moment I started here, everything felt different. The environment is welcoming, supportive, and truly empowering. What I appreciate most is how comfortable I feel during my workouts. It's not intimidating, and there's a strong sense of community. The coaches are encouraging, knowledgeable, and genuinely care about our progress. They always striving to educate us--whether it's proper form, technique, or understanding how to get the best results and our diet which makes a huge difference. The workouts are effective and focused, especially for glute and full-body sculpting. I've noticed improvements in my strength and confidence, which has been really motivating. I'm really grateful I found this place. It's a space where I feel supported by others and encouraged to keep showing up for myself. Highly recommend to anyone looking for a positive, women-focused fitness community! I would like to add too HUMOR! Expect To Laugh A Lot!

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    PeachBody Studios
    PeachBody Studios
    PeachBody Studios - Even on your birthday you're celebrated with a good sweat! It truly feels like family here!

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    Even on your birthday you're celebrated with a good sweat! It truly feels like family here!

    Greg Cornejo - Legs looking amazing

    Greg Cornejo

    5.0(11 reviews)
    1.0 mi

    I have worked with Greg for only 7 months, consistently once every week, and I have seen real…read moreresults with his training. Greg is down-to-earth and a no BS trainer that pushes you to become the best version of you. His charisma comes from his outspoken attitude and experience working as a personal trainer at other gyms. I can tell that he is very smart and well-informed in the type of work that he does, and I strongly believe that will carry him far along for his own personal goals. He is also very professional and knows how to think ahead. If a gym or environment does not meet the needs of his clients, it does not meet his. This is someone that knows how to work with people and will definitely have a bright future ahead of him.

    100% recommend I…read morecame to Greg as a referral from a friend who had been working with him and got great results. I wanted a female trainer but my girlfriend insisted he was great and I saw her results and decided to try him out. I have been amazed by his fitness knowledge! Any questions he answers with research and stuff he's tried and cuts through all the BS. Since I've meet him a few months ago, he's been on a cut and you can tell he knows his stuff because he gets the results he wants for himself & his clients. I request heavy on the lower body & my legs look amazing! I feel super confident wearing short skirts this summer & putting on a bikini at the beach every week due to how toned I look! He is efficient! My one-on-one sessions are one hour but I put in work! He personalizes each work out to me depending on my goals and we get to it! He makes sure each rep & set are optimal for me and we adjust throughout the session depending on what my body can do that day. Greg has taken me to failure, I've cried, I've puked and I keep coming back! He pushes me in just the right way, something I could not do on my own. My workouts with him are super fun and I always look forward to them! I have no reservations about endorsing Greg to anyone! I also would like to add I have a PCL tear and he makes sure I'm safe. I've had major improvement in my chronic pain since gaining muscle that's improved my daily life.

    Photos
    Greg Cornejo - Post- leg day

    Post- leg day

    Greg Cornejo - One of my most consistent clients!

    One of my most consistent clients!

    Greg Cornejo

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    Fitness Underground - gyms - Updated September 2026

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