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Diamond Bar, CA

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Fitness 100

4.5 (31 reviews)
Closed • 9:00 am - 9:00 pm

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Be at 29.7 percent body fat before training
Steven L.

I grew up in Diamond Bar and I've tried all the big and small bouquet gyms around Diamond Bar and Walnut (I don't want to name names but if you are from here, you would know which ones I'm talking about). Then I found fitness 100. Fitness 100 is a gym that has a nice environment and nice people inside. If you're just getting started to fitness and worries about ego at the gym, Fitness 100 will make you feel right at home and non of that ego and face things exist here. I started at 29.7 percent body fat and obese to now. Feels very comfortable here focusing on my own training with my trainer. There's about 7 regular trainers that trains clients here. EVERYONE of them and I mean EVERYONE is really nice and friendly. There's also a Zumba and yoga room in the back of the gym that can let clients stretch, and do other activity a besides weight lifting. And last things, the owner Steve. He's the icing on top man! He's so sarcastically funny it's unbelievable ;) Give fitness 100 a try guys!

Dong L.

My friend and I have been coming here everyday for a month now! We really like the place, its clean and fits our needs! We start seeing our body transforming already! highly recommanded for people who wants to make a change in the way they look!

My favorite work out piece!

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5 months ago

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1 year ago

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2 years ago

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2 years ago

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3 years ago

Working out with Lucio is great, he helped me to get back on track and building a healthy lifestyle

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Alexis C.

Happy to have you at our gym!

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2 years ago

i like this place because it teaches me how to exercise. I would highly recommend this because the fitness trainers makes working out fun.

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2 years ago

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9 years ago

Helpful 5
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3 years ago

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Alexis C.

Glad to hear you like the gym, it’s always a blast training you!

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5 years ago

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Alexis C.

We're glad you enjoyed it, thanks for coming in!

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10 years ago

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Steve L.

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11 years ago

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6 years ago

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9 years ago

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9 years ago

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10 years ago

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9 years ago

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10 years ago

Business owner information

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Steve L.

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12 years ago

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10 years ago

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12 years ago

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Steve L.

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10 years ago

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10 years ago

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11 years ago

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11 years ago

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Steve L.

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11 years ago

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12 years ago

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8 years ago

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9 years ago

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12 years ago

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Steve L.

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10 years ago

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Ask the Community - Fitness 100

Confused with the pricing, how come it's only 15 dollars a month with trainer and 40 without trainer? Is this correct?

Thanks for the question! The original price is $40/month if you want to use the gym without purchasing personal training sessions. We offer an ongoing discount if you do purchase sessions.

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Review Highlights - Fitness 100

“When you're like, "Oh my god I could've bought like 10 boba drinks with this session," then you will work your ass off to make the most out of it.”

Mentioned in 2 reviews

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Curl Fitness Diamond Bar - My favorite section !!!

Curl Fitness Diamond Bar

3.6(65 reviews)
2.6 mi

Felt the need to leave a review because I've had nothing but a great experience here…read more My little brother and I were looking for a gym after moving back home, so we tried several in the area before checking out Curl. We met with the general manager Gustavo, who was very friendly and accommodating in helping us find the membership that made the most sense. I didn't end up getting my own membership since I'll be moving out again in a few months and Curl doesn't have many locations, but I've been able to come as my brother's guest. We even got my mom to sign up which says a lot given she's pretty high maintenance about cleanliness and wasn't going to the gym at all before this. Now she goes almost every day and loves the zumba classes. In my opinion, this is the best all-around gym for the price. It's cleaner than 24 hour and LA fitness, it's never so crowded that I'm waiting forever for equipment, and unlike planet fitness, it has a great selection of free weights. They also have newer equipment including a hip thrust machine and pendulum squat. I used to go to 24 hour whenever I came home on school breaks, and I've never been able to grab a spot at the squat racks with bumper plates. At Curl, I've never had that problem, even though I come almost every day. On top of that, Gustavo and the rest of the staff have always been welcoming and helpful. Overall, it's been a really positive experience and I'd definitely recommend Curl to anyone looking for a solid gym!

CRITICAL UPDATE (Sept 8): FORGERY & UNAUTHORIZED BILLING FOUND…read moreI am updating my previous review because this situation has escalated from deceptive sales tactics to outright fraud and forgery. The Forged Termination Form: Instead of replying to my September 7 email, the General Manager, Gustavo Guzman, deliberately started a brand-new email chain to send me a Membership Termination Form. This document features a forged signature submitted completely without my consent, stating that I am liable for all outstanding fees and charges. Hidden Fees: Shockingly, the form he forged contains absolutely no financial fields, dollar amounts, or fee disclosures. Mr. Guzman entirely hid the financial implications of this cancellation from me and never declared any charges. The $130.99 Unauthorized Math: I immediately called ABC Fitness Solutions (the third-party billing company that collects fees for Curl Fitness) directly. They confirmed that this forged cancellation request has officially scheduled an unauthorized $130.99 charge on my account for September 25 ($99 termination fee + an additional $31.99 monthly fee). Mr. Guzman cannot legally forge my signature to dictate my payments, nor can he use a medical code to cancel my contract while simultaneously charging me a waived termination fee and double-billing my prepaid dues. Current Actions Taken: Corporate Escalation: I reached out to the Curl Fitness Corporate Office at 949-673-7777 and have been directed to escalate this to Mr. Bill for an immediate corporate fraud investigation. Federal Reporting: I have officially filed a fraud and forgery report with the Federal Trade Commission at reportfraud.ftc.gov. BBB Dispute: A formal complaint detailing these fraudulent practices has been updated with the Better Business Bureau (BBB). Do not trust Curl Fitness Diamond Bar. They will sign your name to legal financial documents without your permission. Check your bank statements and fight back!

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Curl Fitness Diamond Bar
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Planet Fitness

Planet Fitness

4.0(64 reviews)
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First-time visitor to the location, and I was impressed…read more This gym is large and offers members everything they need for a great workout. There are numerous types of cardio machines, free weights, many types of weight machines, a stretching room, a quick workout area, a massage and spa area, clean restrooms, and locker room areas. The staff members I came in contact with during this visit were extremely friendly and helpful. The gym itself was very clean, and great energetic music was played on the overhead speakers. My workout and visit here were very positive.

I can honestly say that Planet Fitness is the cleanest gym with the best service of any I've been…read moreto in this area. Did you know they actually lift up the treadmills and other machines every month just to clean underneath them? They use foam cleaner on all the equipment every single day, and the restrooms are guaranteed to be scrubbed with disinfectant first thing every morning. They even use high-pressure power washers to clean the showers! ​I can say with full confidence that it's as clean as my own home. Even the massage chairs sometimes carry the fresh scent of cleaning solution. As for the staff, they are incredible--always greeting you warmly. You can tell the employees have a great relationship and truly treat the place like home; some have even worked there for years. ​There's absolutely nothing to complain about. Even the members there are high-quality and make sure to wipe down their machines after use. I also have a membership at Curl Fitness--and while their facility is newer, their equipment is filthy and covered in dust; some machines even feel sticky to the touch. Plus, the AC at Planet Fitness is always ice-cold, whereas Curl tries to save money by not running the AC in the winter, making it uncomfortably hot inside

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Planet Fitness
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Aspire Fitness Walnut - Our trainer Christy doing what she does best! Attentive, caring, and, most of all, supportive towards any fitness goal.

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5.0(191 reviews)
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My husband and I came to Aspire when our ldl cholesterol was high, we were at our heaviest, and…read morefeeling super unhealthy overall. We're definitely not the most disciplined people, so we knew we needed accountability. Phil and Johann were exactly what we needed! I've lost 15lbs so far, my eating habits have improved dramatically, and my lab results are now looking great. I really appreciated that Phil took the time to understand out current diet before making recommendations. It made transitioning to healthier habits feel realistic and sustainable. Johann is incredibly knowledgeable and always tailors workouts to your goals. He's great at listening and making sure you're working on what matters most to you. They're both genuine, funny, and make workouts fly by. If you're looking to improve your health and want trainers who truly care, I highly recommend Aspire!

My wife pushed me to try Aspire because we were gaining serious weight, and I knew I needed to take…read moremy health more seriously. I'm so glad I did. I'm down 10 lbs, have gained muscle, and most surprisingly I eat more greens now than I ever have in my life. It's actually become a normal part of my diet I'm a huge foodie, so changing my diet and actually making it sustainable was my biggest challenge. Phil somehow found a way to make healthier eating work for me without feeling like I was giving up the foods I love. Johann has been instrumental in my training, helping me push further with weights and gym equipment while improving my posture, strength, and overall form. I've noticed a real difference in both my physical and mental health. They're both super knowledgeable, relatable, and really cool guys to work with. Definitely worth the investment!

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Aspire Fitness Walnut - Cindy. 164-121, 4 months progress. Amazing work!!

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Aspire Fitness Walnut - Down over 30lbs! Before 188 after 155.

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Down over 30lbs! Before 188 after 155.

Kim's Power Fitness - Kim - A trainer that cares about her clients!

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5.0(12 reviews)
1.8 mi

This studio is in a shopping center near H-Mart, but not in the same plaza as H-Mart. Parking is a…read morebit hard, the lot is kind of tight and you're competing with the patients going to the doctor next door. The owner Kim is so friendly. I liked the exercises she does, it's different than the other places I've been to. When I went, she had us use a step, so we were doing step aerobics type of exercises which I haven't done in about 10 years, but we had a full body workout by the end of the session. The studio can probably accommodate about 10 - 12 clients per class. I like that she is constantly keeping an eye on all of us to correct our form while we are exercising. In addition to the power workouts, she also does nutrition and offers Pilates, yoga, and Zumba classes so you can take care of yourself mind, body, and spirit!

Following up with my previous review, Coach Kim continues to be the most talented and creative…read moretrainer I've ever seen. She knows how to make every class fun, engaging, and full of sweat while ensuring workouts are effective and personalized for every client. Her training programs are designed to push you to your limits while still being safe and enjoyable. She pays close attention to form, helping clients avoid injuries and maximize results. Beyond fitness, she's also a certified life coach who genuinely cares about her clients' overall well-being, making her sessions both physically and mentally rewarding. On top of that, her gym is always well-maintained, organized, and equipped for the best workout experience. If you're looking for a trainer who will challenge and inspire you while making fitness enjoyable, I highly recommend Kim Power Fitness!

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Kim's Power Fitness
Kim's Power Fitness - Stretching after each workout

Stretching after each workout

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Fitness 100 - healthtrainers - Updated October 2026

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