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Diamond Bar, CA

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Fitness 100

4.5 (31 reviews)
Open • 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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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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JP Fitness - Sculpt the strong, confident body you deserve! Start now and reach your fitness goals!

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5.0(20 reviews)
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Well, this review is about 4 years late but some things are better late than ever, right?…read more I first reached out to JP in 2016. At the time, I was going to the gym, following random workouts on social media, and eating to my hearts content. I had very little knowledge regarding training, body composition, and nutrition. After a few months of working with JP, I started to not only gain momentum with my training but also began to see drastic changes to my body. I was so convinced and confident of my progress that I decided to take it to the next level, and compete in NPC as a figure competitor. In April of 2017, I competed in my first NPC show and placed 1st in women's figure. JP's guidance helped me overcome some of my deepest insecurities. In addition to all the things a personal trainer is expected to teach you, weight training, cardio regimen, and nutrition. JP also indirectly helped me with my confidence, mental clarity, advanced methods to training and nutrition, how my body responds to different types of foods, and the list goes on. These photos speak for themselves. The success and results I achieved with the guidance of JP are beyond exceptional. Although these achievements are great, what I cherish the most is the knowledge I gained from working with JP. It is now 4 years later, and still sometimes I can hear his voice in my head during my own training sessions LOL. Thank you, JP. I am forever grateful.

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JP Fitness - Benefits of having a strong back:
1. Posture improvement
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Kim's Power Fitness - Stretching after each workout

Stretching after each workout

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Iron District
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Fitness 100 - healthtrainers - Updated October 2026

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