I was in the area and I was looking for a gym that was a little less crowded and this exceeded my expectations. I saw the reviews for this place and decided to call and get a day pass. It's true that people are more respectful at this gym because when I walked in everything was clean and everyone was wiping things down and re-racking their weights. It makes for such a better lifting experience when everyone respects the equipment and facility. You sign up on an app and you beep in via a bluetooth system which was convenient for my early morning lift. I even got to meet the owner Ian, and he was cool and helped me get a day pass fast which was great! I intend to come back here! 10/10. read more

I have been going to Fitness Underground for a year. The gym is designed with a focus on power lifting and overall strength training. I was especially interested in lifting heavy weights but I wanted an experienced person with me to avoid injuries. I was in need of a personal trainer to help me achieve my fitness goals. I had a great experience training with Denisse! She was incredibly personable, encouraging, and made every session enjoyable. She paid close attention to my form, provided helpful corrections, and explained everything clearly, which gave me the confidence to lift heavier weights safely. I left each workout feeling stronger and more capable. I highly recommend her to anyone looking for a knowledgeable, supportive, and motivating personal trainer. read more

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. read more

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I've been coming to FU since July 2024 and it has changed my life. As a female, I was always intimidated by weights but I hired Denisse as my coach and she has taught me proper form and safety. Thanks to her, my confidence has boosted tremendously. Ian, the owner, has an open door policy. Whatever the concern is he is on top of it. The culture in the gym is not like the commercial gyms like planet fitness or chuze. Highly recommend read more

Ever wondered what it was like to work in an underground gym? Well this one isn't, BUT, it's still a freakin cool gym. Unlike your standard gym, this is not only private, but CLEAN. Everyone carries sanitizing sprays to disinfect after work outs. Say bye bye Hepatitis, conjunctivitis, and all other germs that make us physically unattractive, because it's CLEAN here. Because of the small community of gym members here, every one is pretty familiar to one another, therefore you feel a sense of comfort and motivation to be as strong as them. AND. AND!!!!!! People actually re rack their weights. Can someone play heavenly music for me? Love the culture here at Fitness Underground. Everyone is supportive, kind, and courteous of one another. Definitely recommend this private gym to anyone looking for a serious gym for serious gainZ. read more

I joined Fitness Underground back in 2021 and have been a member for 3+ years. The gym owner Ian is the first person to welcome you, give you a tour, and get your key fob set-up. Coming from someone who used to go to Crunch, one thing that I loved about FU right off the bat was the difference in the environment. FU feels very welcoming and comfortable to work out in and the members+trainers here are incredible. People clean up after themselves and are so friendly. Another thing I appreciate at FU is how dedicated our gym owner is to constantly improving and upgrading the gym. He truly cares about his members and will listen to your feedback, change up the gym layout if necessary, and get us new equipment/amenities :) There are a lot of Powerlifting gyms to choose from in the area but by far Fitness Underground can't be beat in environment, high quality equipment, and price. read more

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! read more

Fitness Underground - Gyms Near Me - Upland, California

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I love this gym! It is so CLEAN. Everyone is respectful of the equipment and other members. It is the feel of a small gym community with so much to offer. Great variety of weights and equipment PLUS changing rooms and a dry sauna. It is very convenient as it is open anytime you are ready to workout. As a member you get your own key fob. They also have great trainers to guide you and also help with nutrition. Highly recommend this gym! read more

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. read more

Fitness Underground - The front of the gym - Gyms Near Me - Upland, California

Been a member since 2021 and the way the owner has always made sure to take care of the members needs is awesome, gym expanded recently and the gym equiptment from specialty competition equipment to accessory machines is unmatched read more

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

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Been a member here since the start of February ! I love this gym ! Always nice and clean and weights are where they're supposed to be. So much better than your normal crowded commercial gym. read more

This gym is dope, everything you can ask for and more. Everyone who is in there is goal oriented and stands on business. I'm glad to be part of the gym. read more

I have had nothing but positive experiences at Fitness Underground. Their recent expansion has made it a fitness goer's dream environment. If you're a powerlifter, this is the place to go. Over 9 platforms, several kilo racks, 6 deadlift platforms, I couldn't ask for more as a powerlifter. Several pieces of cardio equipment make it easy to lift and run. Everyone in the gym is friendly and the environment is super clean and organized. The owner and his wife are so great and send out holiday cards which makes it feel like a family. I'm so happy to be an FU member! read more

Having no previous experience with weight training, I was a bit intimidated first joining this gym. 29 months later, I can confidently say, I am so glad I did. Since I became a member, I trained with Marisa; one of the owners. She made me feel so welcomed right away, that my intimidation soon went out the window. Marisa is an amazing trainer, she's passionate and very knowledgeable. I really enjoyed how every session was a different circuit, allowing me to broaden my scope on workout routines. I have gained so much confidence, endurance and overall strength, all thanks to my time at Fitness Underground. PS. Current brides if you're looking for motivation to fit in your dream dress... this place will do it. I lost 2 dress sizes in 8 months. Join today to see for yourself! read more

Fitness Underground - Fitness Underground - Gyms Near Me - Upland, California

Amazing and well established powerlifting gym. The amount of equipment is phenomenal and super friendly with bodybuilding training as well! The lighting of the gym is great and has multiple combo rack available as well as deadlift platforms. Met Ian and such a friendly individual to talk to and very helpful with showing me around and how the gym was first to come and the evolution of the gym is great definitely recommend 10/10 for anyone in the upland area!!! read more

I love the gym! I came here a year ago and been treated like family ever since. This is amazing place if you are serious about lifting or even just want better equipment than a commercial gym. Ian is building a great gym and i appreciate everything him and his entire team does here and I know he will keep doing more for the gym in the future! read more

I finally found a gym that I actually want to go to. There is no doubt that Fitness Underground is more expensive than a standard chain gym but the cleanliness, organization and always available equipment make it worth the extra money. This gym has everything for anyone just starting out in their gym journey to expert lifters looking to build a community and participate in competitions. I highly recommend Fitness Underground to anyone in the Ontario, Rancho Cucamonga and Upland areas. read more

I joined FU in October of 2023 and have had the best experience! When I joined I met with Ian who gave me a tour and listened to my goals. He connected me to Denisse who I have been working with her ever since! She is an absolute rockstar who truly cares and gives her clients her all. Working with Dee has not only given me physical results but she has taught me how to have confidence in myself and what I can do! You couldn't ask for a better gym community than Fitness Underground! read more

Been training at Fitness Underground with Daniel since September 2023. I can already notice huge transformation in my strength, posture and energy levels. I walked in months after having a baby and Daniel got me strong enough to run after my little guy. Friends and family notice the weight loss and transformation. Not to mention, he gives food tips and tricks to get the most out of your diet. Highly recommended Daniel for personal training and the weights at Fitness Underground. read more

Fitness Underground is the best gym I have ever been a part of! The owner, Ian, has done a fantastic job cultivating the most amazing gym environment and culture! All of the equipment is state of the art and the atmosphere is always warm, welcoming, and positive. On top of that, the gym is open 24 hours to members and he even throws parties for members several times a year. Fitness Underground is a level above all other gyms and I can't recommend it enough! read more

Fitness underground isn't your regular gym, everyone that trains here is very knowledgeable and willing to help out those who are just staring their own fitness journey. Great gym for the most knowledgeable and for people starting out, 10/10 would recommend! Ps. if there isn't any sour patch kids in the vending machine I ate them all (: read more

After coming off an ACL tear, I wanted to get into better shape after rehabbing my knee and I found Fitness Underground. At first, I was hesitant but the 24/7 availability and seasoned trainers convinced me to give it a try. Best decision ever! I began my training with Ryan immediately and quickly learned how out of shape I had become. Ryan not only put my training plan together but also taught me about my nutrition and how to better it. He also made it his priority to teach me about the different muscle groups and which muscles each workout was geared towards strengthening. I feel far more comfortable coming into the gym on my own and knowing how to workout and which muscles to work on. It's been a couple months since we began and I've see drastic changes and more importantly feel much better physically and mentally. I would 100% recommend Fitness Underground and Ryan as a trainer. read more

MY STORY: I was looking to get back into fitness after a 10 year hiatus. Knew I wanted to hire a professional for guidance and accountability. Found Fitness Underground by searching Google for a personal trainer near me. Clicked the first search result which directed me to Marisa's profile on the Fitness Underground site. Her profile checked all the boxes of what I was looking for. Went in the following day and signed up. Marisa is an awesome trainer! Not only is she knowledgable in her profession, but she is an incredibly kind and compassionate person. I became stronger and happier in my 90 days training with her. If you're a newbie to fitness or getting back into it, I highly recommend hiring a trainer. Trust me. Makes a world of difference. GYM HOURS: 24/7 key fob access. Doesn't get better than that. STAFF: Gym is operated by husband and wife duo, Marisa and Ian. When they're not training others, you'll find them working out themselves and are happy to assist your form or be your spotter. Their other trainers are also helpful. EQUIPMENT: Powerlifters rejoice, this place has everything you need. While the facility itself is small, the equipment is functional for all types of training needs. CLEANLINESS: Very clean! Being a powerlifting gym, never saw chalk mess. They have individual spray bottles and cloths you can pick up at the front to have while working out to sanitize stuff as you move about. OVERALL: This is a private gym that offers a community environment. Other members keep to themselves, are respectful, but are friendly enough to offer a hand if you ask. All around great place to work out and transform your life. read more

Fitness Underground is an absolute gem in the world of powerlifting gyms. The owner, Ian, has created a haven for fitness enthusiasts by holding social events, access to healthy meals and going as far as asking members what equipment the gym may be lacking in order to fulfill everyone's needs. The gym excels a welcoming atmosphere and has strong commitment to maintaining it clean, organized, and well-equipped. The members are friendly and supportive whether or not you are experienced lifter or just a beginner. To add, Renato, my trainer has been great the last 3 months. As being a first time power lifter, Renato created a motivating and supportive atmosphere while guiding me each step of the way. The attention to detail in his coaching, coupled with his positive demeanor, made each session enjoyable but also challenging. My strength and form continues to improve week over week ! I have tried many gyms in the Sol Cal area ... if you're serious about your powerlifting journey or just getting back in shape, this gym should be your go to. read more

I was a little intimidated at first, due to my lack of experience with weights, however after 22 months of personal training, my life has changed dramatically for the better! I'm actually considered a senior citizen so I have a lot of life experience. Not only does this gym have a great vibe but the owners and the people here are the coolest, most supportive group I've ever met. Its nice to be surrounded by encouraging and like minded individuals who embrace positive change and are down to earth. Personal training has been life changing for me and this seems to be the secret for the fountain of youth. My balance is better, I sleep extremely well, I've lost over 21" of fat, and I feel amazing! Not bad for 61 The gym is always clean, accessible 24 hours a day and they are always adding new equipment, food options and education. Thia is my favorite place to be and Marisa is the best personal trainer! read more

I have been a member of Fitness Underground since June 2022. I can without a doubt say that this is the best gym I have been a part of thus far. I have been in multiple commercial gyms over the years and built a small home gym during the pandemic. My fitness journey has been up and down but became consistent during the pandemic and I started to reach my goals. However, I injured myself and started to stagnate in my physique and strength goals. Despite buying multiple training programs I improved slightly at best and not at all in most areas. I needed personal training. I looked around the area and spoke with multiple gyms and trainers. In the end, I chose Fitness Underground. This place provided me with more than I needed. The owner, Ian, show me around the gym, told me about his experience within the field, and worked with me to come up with clear goals and how I can achieve them. He was kind, and informative, and answered all my questions and concerns, especially when it came to my previous injury. He was direct and upfront about the pricing and offered competitive prices when it came to personal training. He did not pressure me into coming to the gym in any way and allowed me to think about my choice. He also asked me questions in order to understand me and my experience instead of just trying to sell me personal training like the commercial gyms have done in the past. He didn't guilt trip me. It felt like an actual collaboration. Since joining I have made more progress than I ever have on my own. He created a training program specifically tailored to myself and my goals. He would make adjustments mid-workout based on my performance. My experience with Ian has been nothing but great so far. He helped me push myself and overcome the fear that my previous back injury gave me. He does more than just tell you the workout, he helps you understand why you are doing this specific exercise and makes sure you are doing it correctly and safely. He helped me improve my strength, physique, and on top of that, my confidence. The community within this gym has been more than I ever expected. I am use to the regular commercial experience of people going in and out and nothing more. Fitness underground gave me a community that I did not realize I wanted. People were kind, supportive, and encouraging all around. They remembered who I was and can be seen supporting each other and hyping one another up. Everyone has been welcoming and became something that I looked forward to each time I showed up. I use to love it when the gym was empty, but now I show up when I know people will be there. The gym itself is kept clean, and organized, and provides you with more than enough equipment. There are a multitude of platforms to deadlift, racks to squat/bench, barbells to use, and dumbbells of weights that I cannot lift just yet. Everyone helps keep everything organized and clean. There is more than enough space to work out and nothing feels as though it is crowded. Whether your goal is bodybuilding, powerlifting, or simply just trying to improve yourself. This gym offers more than enough to help you achieve your goals. If you are looking for a gym that allows you to push yourself, has a welcoming, caring, and supportive community, equipment that allows you to test your limits and help reach your goals, or trainers that actually work with you then I can honestly recommend fitness underground. While I had to move away for work as of January 2023, this Gym has always stood out to me and became a high standard of what a good gym and community can be like! read more

I have been personal training with Marisa for a while and I have to say it's been the best experience ever! She motivates you, she supports you, she even provides you food menu for your journey to get successful results. She customizes your workouts based on your personal fitness level and goals. I have seen great results with her!!!!! The gym is super clean and well kept! read more

This review has been long overdue. Firstly, I have to give a big shout out to my trainer Ryan he's been an amazing and supportive mentor and friend in helping me reach my fitness goals. He's extremely knowledgeable and his method (being science based) is extremely effective and functional -I haven't seen as much results in my previous two years of working out as I have working with him. Secondly, the gym is a great space to work in and is well kept at all times. Most of the equipment is available at all times and Ian is always brining in new equipment which is pretty exciting. The vibe is always chill and inclusive to anyone that wants to join. The gym is open 24hrs a day which is a huge plus for me as I sometimes have a tight schedule. If you're looking for a good spot to get some hard work in and maximize some gains I recommend checking it out! read more

Excellent private gym for powerlifting. You can tell the owners are highly dedicated and care about their members. The gym is clean, there is 24/7 key fob access, and everything is well maintained. The members have great gym etiquette (reracking weights, keeping your area tidy), which is far better than the mess you'll find at a typical commercial gym. I didn't have to wait in line to use a limited amount of equipment (which is often a dealbreaker for other gyms). High quality equipment and community. Definitely recommend! read more

I found Fitness Underground through its Yelp reviews a few years ago, so now I want to add my own. I was looking for an alternative to CrossFit and wanted to focus on gaining strength, so a powerlifting gym seemed like a good fit. I found this gym and have never looked back. The gym is always super clean and has a wide variety of equipment that can suit anyone's needs. I was worried about working out by myself because of intimidation, especially since I am in my mid-40s and was going to be around a lot of younger folks. But seriously, no one cares. Everyone is there to get better and help each other out. No egos. I've been doing personal training with Ian and continue to see my max lift numbers go up, which is exactly what I want. If you are looking for someplace new, grab a day pass and check this place out! read more

A really great gym! Has all the equipment you'll ever need plus equipment that commercial gyms don't normally have. I would definitely recommend coming here if your looking to reach your weight lifting, bodybuilding, or powerlifting goals. read more

Extremely well-ran gym, with everything a lifter needs to get a great workout in! I was very fortunate to come across this place, and I'm glad that I did. It's very clean, and the members are all very friendly and polite. I will definitely be lifting here for the foreseeable future, highly recommend!! read more

Great Equipment! Professional Lifting equipment, same or better than what is in competitions, and its new! Even have a wall of extra belts, bands, resistance chains, chalk...Enough equipment to always have your own rack, platform or bench. Other members and staff are encouraging, open to spot you, or even lift with you. Many of the members and staff are (winning) competitors, and understand importance of form. Also boot camp, sleds, etc. for cardio. read more

I have been training at Fitness Underground for about a year and a half. I originally started training with Ian, the owner, to get in shape for my wedding. Ian is not the first trainer I have used but his approach to working out has truly changed my life. The first couple of months were hard, not only because I was not used to working out to that extent, but also because getting up and working out before work is difficult. Still, that hard work changed me, and I do not see myself not having a trainer like Ian ever again. Working out twice a week with Ian truly gave me the best results I have ever had. Now I have a 9-month year old baby and can only train with him once a week. I look forward to that training session every week and any chance I get, I try to squeeze another session in. I drive 30 minutes in the opposite direction to get there every week and I have no regrets. If you are looking for a gym that's open 24/7, has legit equipment for deadlifts, squats, powerlifting in general, I promise you, Underground Fitness is where you need to be. It is of course clean, well maintained and has healthy food/snacks readily available but what is most important to me is the time, energy, and effort Ian puts into every session. I whole heartedly where the apparel and genuinely see Ian as a friend. Don't believe me? Come on Thursday mornings so I can prove you wrong. read more

This gym is awesome! Ian, the owner, is helpful, knowledgeable, and always willing to help out when you have a question. His personal training programs really help you reach your goals, no matter where you are in your fitness journey. He has done an amazing job of building a supportive community within the gym as well. From the equipment to the people, this place is top notch. If you're looking for a true gym that is dedicated to helping you reach your fitness goals and are tired of the big box commercial gym environment, this is the gym for you! 10/10 would recommend! read more

Me and my fiancé have been going to fitness underground for a little over 7 months. My wife contacted the gym trying to get more information and Ian the founder of fitness underground responded back saying he can give us a tour and answer any questions we would have. Me and my fiancé went to the tour and liked what fitness underground had to offer. Ian was our trainer when we first started and we learned a lot from him not only how to workout correctly but also about nutrition and how much it impacts our health. Later on we had to switch over to another trainer named Denisse. She has been a really big help not only does she help us if we have any questions about the workouts but also she explains what each workout does and what it targets. She is a great motivator and we'll push you because she knows you can always do more. Fitness underground has great trainers but also great customers. If you need a spotter or any help with an equipment they would happily help you out. Another good thing about the gym is its cleanliness. read more

I've trained with Marisa who is one of the owners here. She is an amazing trainer. Who will give you the results you are looking for. This gym is everything to me and would recommend this place to anyone who is looking for a better way to train. This gym isn't a place where you would feel uncomfortable because of members here aren't looking at you and giving the eye. Everyone is helpful and has no problem encouraging you. You have 2 owners who do their very best to give you what you need. You have people here who take pride in what they do and who keep improving what is their "baby". They now have 24 hour excess with key fobs and they also have cameras constantly running for that security you need. I can go on and on about how much I love this place. But I just recommend you come take a look for yourself and talk with a trainer or talk with the owners Marisa and Ian. read more

Not too long after New Years, I was on the traditional "I am going to get in shape this year" kick like everyone else who set new year resolutions. I had seen an ad on Instagram for Fitness Underground and thought, man this could truly be a different experience and it's so close in proximity! At the time, I was working out a Chuze and didn't necessarily have any complaints, but lacked the closed-knit atmosphere and lacked the free weights I grew up being used too as a football player. I had signed up, not necessarily seeing the gym itself, but didn't necessarily have the motivation to get in there. It wasn't until the owner Ian called me and let me know that he felt bad charging me for another month without me stepping foot in the gym. He ask when I could make it in so I could check out the place and get the feel of the place. Shortly there after our conversation, I was able to meet Ian officially and also go over some of the basics for lifting and testing my strength. It was humbling to see that I wasn't as strong as I thought, but also reminded me the reason I was here in the first place. Ian offered to build out a personal program for me and has continuously done so for the last 7 months. I can tell you from personal experience, the programming has helped me "check my ego at the door" as Ian would say as well as encouraged me to continually come back and try to dominate another week as it gradually edges you up in "PR's" or personal records. I can say confidently, I am stronger than I have ever been in my life, I have more confidence than I've had in a long time and I truly love my gym. It's a place where you can be yourself, are encouraged by everyone and where the owners Ian & Marisa believe in their athletes and want them to have the best atmosphere to compete, to better their lives and to have a place to belong. If you are looking for a change up in weight lifting or a place just to get back in shape, definitely give Fitness Underground a look. I personally have enjoyed my experience and transformation. Thanks for all the support F.U. I am forever grateful! read more

Being a power lifter I am big on being able to have access to variation of bars, weights, and platforms and Fitness Underground is truly a work of art. Ian does a great job of not only understanding his cliente but more importantly catering to their wants, needs, and desires. Every time I walk in it's always CLEAN!! If you have ever been around a gym full of power lifters you know how hard it is to keep it clean with the amount of chalk that is used DAILY! Although the trainers are not employees of the gym they do a great job of making you feel secure. Being a 24 hour access gym I can only try and imagine how difficult it would be to keep it clean. Besides that the main room is aesthetically pleasing especially to someone who invests into recording his main lifts. Thank you Ian and company for being one of the most impactful facilities that local athletes get to call home!! read more