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Fitness 100

4.5 (31 reviews)
Closed 9:00 am - 12:00 pm
Updated 2 months ago

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Services - Fitness 100

Group fitness

Personal training

Virtual fitness classes

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Recommended Reviews - Fitness 100

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Reviews With Photos

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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19 days ago

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9 months ago

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1 year ago

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2 years ago

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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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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

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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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9 years ago

Helpful 5
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4 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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6 years ago

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10 years ago

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8 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

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Steve L.

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11 years ago

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9 years ago

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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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Steve L.

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11 years ago

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10 years ago

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Steve L.

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11 years ago

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8 years ago

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11 years ago

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8 years ago

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11 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

3.8(59 reviews)
2.6 mi

Amazing gym! Been coming here for over a year now and got…read moremy buddy to also sign up after training him for a while. Gus and his team are very attentive, but also fun and energetic at the same time. Whether it's Liz or Ricardo at the front desk helping you, everyone seems to care! And that goes along with the trainers too! Vibes are immaculate, always clean gym, always a great workout, lots of variety. Lots of amenities from classes to massage rooms! Please bring the sauna soon!

Curl Fitness was originally a Crunch Fitness, which is why you'll still see some of the old Crunch…read moretrainers working there. ​The Pros: The biggest advantage of this gym is the variety of classes, like dance. Their equipment is also top-notch, especially the free weights--they use some of the best brands in the industry. Because of the high-end equipment, you'll notice that the membership fees are on the higher side. ​The Cons (Hygiene & Maintenance): Despite the nice gear, the facility is extremely dirty and feels like it's never been cleaned. The handles on the treadmills and ellipticals are often sticky, and there is a thick layer of dust underneath the machines. It's gross! If you've ever been to the Planet Fitness in Diamond Bar, you'll realize just how dirty Curl actually is. ​The most shocking thing I've witnessed is the cleaning process. The cleaning lady uses the same brush to scrub the inside of the toilet bowl and then the toilet seat. Seeing her scrub the bowl and then immediately wipe the seat with the same tool is horrifying! To be clear, she works very hard and I'm not blaming her personally--management simply hasn't provided her with the proper tools or training. Additionally, there is a light in the shower area that has been out forever and never gets repaired. ​Atmosphere & Service: Another bizarre thing is that they don't turn on the AC during the winter. It gets incredibly hot inside. Perhaps that's better for the elderly members, but it's uncomfortable for a real workout. Furthermore, the front desk staff is completely indifferent; when you walk in, they treat you like you're invisible. ​Bottom Line: I only kept this membership because my child has an enrichment class nearby, and it's a convenient place to wait. If my kid weren't taking classes in this area, I definitely wouldn't keep this membership.

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Curl Fitness Diamond Bar
Curl Fitness Diamond Bar
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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.

Aspire Fitness Walnut

5.0(178 reviews)
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Really great, friendly trainers who provide guidance. Phillip is awesome and taught me so much in…read morea short amount of time.

Phil and Johann are truly exceptional trainers who have transformed my health and lifestyle in ways…read moreI never thought possible. Living with type 1 diabetes for over 25 years means managing blood sugars around the clock--there are no days off. On top of that, working remotely left me stuck in a mostly sedentary lifestyle. I tried countless diets and fad HIIT classes, but nothing ever stuck. That all changed when I started training with Phil and Johann. With their guidance, I not only got my nutrition under control, but I also lost over 25 pounds in just 7 months. Even more importantly, I reduced my daily insulin intake by 50% and lowered my A1C levels--results that both my doctor and I are thrilled about. Beyond the numbers, I feel sharper, more confident, and happier. The brain fog is gone, my mental health is stronger, and (who would've thought?) I even became a gym girlie along the way. Phil and Johann bring a thoughtful, personalized approach to every workout and check-in. Phil makes sure my nutrition aligns perfectly with my goals, while Johann keeps training challenging but sustainable. They're both incredibly dedicated, attentive, and genuinely invested in my success. Their program works because it's tailored to you, sustainable for the long term, and backed by real support every step of the way. If you're serious about making a lasting change and want a team that goes above and beyond, I can't recommend Aspire Fitness enough. Thanks guys!!

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Aspire Fitness Walnut - Love our community here. Appreciate every single person that walks through these doors.

Love our community here. Appreciate every single person that walks through these doors.

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

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

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

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Down over 30lbs! Before 188 after 155.

JP Fitness - Sculpt the strong, confident body you deserve! Start now and reach your fitness goals!

JP Fitness

5.0(20 reviews)
0.0 mi

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.

So...how should I start this? It all started with a group picture I had with my friends. It was a…read morehappy day until I saw the photo that I occupied a lot of space on there. I asked myself, "Self, is that what I want to be?" I decided to find a personal trainer, and I found JP. JP is very different than many other trainers that I talked to who try to say many good things about training and attempt to get you in. The first thing I was told is "It is going to be tough, and it is all about you. Are you sure you want to do this?" I knew I was at the right place the moment I heard this because JP does not sugarcoat the challenges that I will face to get my business but serious about training me and helping me to reach my goal. The journey is challenging but fun. JP is dedicated and knowledgeable. He always tries to push you to a limit while paying great attention to the form and your reaction to make sure you do not get hurt. Trough out the time that I train with him, my body does fill sore but not pain. He also designs the session to train different muscle groups in a different way and different date so the muscles have enough time to recover. Besides training knowledge, he is also a very positive person who always shows his passion for helping others to be better. To me, JP is more than just a trainer but friend. I am glad that I met him and will keep up my journey with him.

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JP Fitness - Benefits of having a strong back:
1. Posture improvement
2. Injury prevention
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JP Fitness - The Smith machine lunge is a variation of the lunge and an excellent exercise choice for isolating muscles of the leg.

The Smith machine lunge is a variation of the lunge and an excellent exercise choice for isolating muscles of the leg.

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F45 Training Diamond Bar

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4.9(55 reviews)
2.9 mi

I've really fallen in love with this style of training. It's nice compared to going to a gym for me…read morebecause I don't have to think. I don't have to worry about whether the squat rack is open or if the machine i want is taken. I don't have to think about what body parts to target. I just have to show up, do the exercises with everyone else and just focus on getting better at them. Everyone here is really nice and supportive especially the instructors Sherry and Vicky, and you'll definitely get stronger if you keep going. I typically go once or twice a week, it's all the exercise I realistically get nowadays and yet I've actually gotten noticeably better cardio and strength. If you're on the fence about it I'd say give it a try. The classes are honestly hard but you can take it at your own pace, and it only gets easier. One thing I love is that there's a sense of teamwork even if you're doing your own workouts. It makes me work harder seeing other people try hard. Overall definitely worth it

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F45 Training Diamond Bar - Mark Wahlberg at F45 Training

Mark Wahlberg at F45 Training

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F45 Training Diamond Bar - We have Bikes as well. ^^

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

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5.0(12 reviews)
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Kim's Power Fitness
Kim's Power Fitness - Most amazing trainer ever

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Kim's Power Fitness - Stretching after each workout

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Stretching after each workout

Iron District - IFBB Pro and Trainer Ricky Urrutia

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4.8(133 reviews)
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Had some great training sessions at SMTF with Isaiah! Isaiah's a friendly and knowledgeable trainer…read morewho genuinely cares about his clients' health. I've always been a little intimidated by lifting, but the way he answers questions without any judgment makes me feel comfortable, and even excited about fitness! He takes the time to explain why we're doing certain exercises and even excitedly offers simple food swaps to support my goals without compromising on my cravings. If you're looking for a motivational trainer who truly cares, Isaiah's the one!

First, this is a great facility. It is always clean, well-maintained, well-ventilated, and has…read moreeverything you need to get a good workout. But this is not a gym; it is a training facility where you work with trainers to tackle your physical goals. Next, this is about my trainer, Kevin Abandy. Kevin has been my trainer for exactly 8 weeks now and he is awesome! I made the decision to get a trainer after my birthday to truly invest in myself. You can invest in your own skills and education, but the return is almost always indirect. But with a trainer, specifically Kevin, I gained 8 lbs of muscle mass and lost 8% body fat (approx. 13-lbs of fat) after 8 weeks of training with him. Also, at the start of my training, I had back pain (from past injury to T12) and knee pains (from under the kneecap). Through Kevin's program and coaching, my pain has been reduced to near 0 with full mobility -- like squatting all the way down and up with 200-lbs of weight on my shoulders with no knee pain. I would give a 1-star review to keep it from getting crowded, but it would be hard for me to not tell others about the good that comes out of this place. My mom is 70 and she's training with Kevin too! And the story is the same for her... knee pains - GONE. Back pains - GONE. If you're reading this and decide to get a consultation with Kevin, please let him know you saw Alex's review so he knows his method is making an impact.

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Iron District
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Fitness 100 - healthtrainers - Updated May 2026

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