Stark

Irvine, United States

4.9

Closed now

18 reviews

By Appointment Only

Contacts

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Telephone:
+1 949-722-7070
Website:
www.starknation.com
Address:
17524 Von Karman Ave, Irvine, CA, 92614
Nearby public transportation stops & stations:
1.3 miMichelson - Harvard
2.7 miTustin
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Bussiness info

Good for Kids
Yes
By Appointment Only
Yes

Today

Today 7:00 am – 3:00 pm
Closed now
Local time (Irvine) 2:38 AM Saturday, June 21, 2025

Business hours

Monday 5:30 am – 8:00 pm
Tuesday 5:30 am – 8:00 pm
Wednesday 5:30 am – 8:00 pm
Thursday 5:30 am – 8:00 pm
Friday 5:30 am – 8:00 pm
Saturday 7:00 am – 3:00 pm
Sunday –

Description

Specialties

We specialize in clients who have «tried it all;» who are concerned about getting injured; who want a comprehensive approach to fitness, including nutrition; who want «serious» training and are concerned about getting the best return on their time.

Utilizing the world’s highest quality equipment, some of the most sophisticated training techniques as well as personalized diets and high quality supplements, Stark is a national leader in rapid transformation for executives and sports performance for athletes.

History

Established in 2002.

A native of Oregon, Brad Davidson began training clients from his garage in Southern California in 2002. Shortly thereafter, he opened a small gym in irvine under the name Synergy Training Centers. In 2011 he, and new partner, Todd Vande Hei, formed Stark to provide fitness, strength and conditioning solutions to executives and athletes alike, focused on taking clients from where they are to where they want to be in as short a time-​frame as possible.

In 2014, after practicing chiropractic medicine for fourteen years, Dr. Jon Gundlach Chiropractic Corporation moved operations to provide soft-​tissue treatment to the Stark clientele. Together with Stark’s in — house Performance Medicine Specialist, Dr. Dayne Grove, N.M.D., the team at Stark provides a three –hundred — sixty degree look at the health and fitness needs of the client.

Contact us to schedule your first appointment!

Orange County chiropractic services provided by Dr. Jon Gundlach Chiropractic Corp.

Meet the Business Owner

Brad D.

Business Owner

A native of Oregon, Brad Davidson began training clients from his garage in Southern California in 2002. Shortly thereafter, he opened a small gym in irvine under the name Synergy Training Centers. In 2011 he, and new partner, Todd Vande Hei, formed Stark to provide fitness, strength and conditioning solutions to executives and athletes alike, focused on taking clients from where they are to where they want to be in as short a time-​frame as possible.

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18 reviews of Stark

No registration required
Place rating: 5
Irvine, CA
This place is great! The female trainer was professional, knowledgeable with a really positive attitude (and this at 6AM in the morning.)
Lucky for me on the day I went to class I just happen to be the only one to show up, so basically I received a personal training session.
You might think that the trainer would of had a bad attitude getting out of bed so early in the morning for just one person to show up for class… but not the case.
This place is cool, clean, good music and great trainers.
Best kept secret in town… Do something good for yourself and give this place a try.
A+
Place rating: 5
Fountain Valley, CA
When I went to one of their free fit back clinics about a week ago, boy was I impressed! I thought, I’m definitely going to sign up for this so I made an appointment for the free body analysis.
There was some confusion on my appointment and it was canceled when I arrived… I was very upset!
I emailed Dr. Todd and told him about my situation. He promptly emailed me back and apologized and asked if there was anything he could do to make it up to me. He listened to my complaint and treated me with dignity. I truly appreciate that he took time out of his day to handle my situation and that he wanted to make sure that in the end I was happy. Thanks for caring Dr. Todd!
Place rating: 4
Tustin, CA
Great workout! Took the Met Con class with Geoff for our first class and even Nam loved it (and he hates group classes!). They are super duper nice from the moment you step through the doors to the moment you leave. I was excited to come here from the reviews, but it’s a totally different feeling once you’ve actually taken a class. It’s hard and you’ll sweat, but it’s fun! New to me were the sled pulls and battle ropes. Intense and I could definitely feel my muscles working! :) Geoff and the other instructors would watch our form and make sure we were doing things correctly. That’s always a biggie for me because I don’t want to injure myself working out, and hope the teachers are attentive enough to notice if I’m dong something wrong. After the class was over, Geoff showed Nam how to work with/​flip Strongman tires. Really nice guy.
We had Tyler another time and he killed us! Really challenging workout with a sled push relay to finish it off. Ahh! I couldn’t walk after, but I definitely felt stronger and accomplished! :P Again, instructor was encouraging and pumped you up to work your best!
I can see why this place is so popular and will keep coming back!
Place rating: 5
Anaheim, CA
Dr. Jon at Stark has changed my life! I’d suffered from months of chronic sciatic pain which left me afraid to move let alone workout. I felt like all I could manage was to sit or lie down and not do much activity for fear of the painful shocks running down my leg. I knew I couldn’t go on like this since my inactivity was really just making the problem worse. After a friend highly recommended Dr. Jon I gave him a try. I had never tried ART before and was a little nervous. The first day I saw him was my last day with pain — I’m no longer afraid to move and have resumed my normal workouts and then some! He’s also worked on loosening up my neck/​jaw (the constant headaches are gone) and my forearms/​wrists (I can now type for hours without any arm pain). I can’t recommend Dr. Jon enough — whether you have an old injury or something acute, don’t waste any more time living with pain and get in to see Dr. Jon!
Place rating: 5
Santa Ana, CA
Thank you Stark Fitness… because of u & your awesome workouts & training this 54 year old rocked it at our annual work softball tournament yesterday… I showed up for work today feeling great… compared to all the other employees who were sore & complained of all kinds of sore limbs… but not Me!!! I could kiss you all!!! Thanks again… See you on Monday morning…
Place rating: 5
Santa Ana, CA
When I was ready to make a change, Stark was right there. Ready to customize a workout program for my skill level, ready to deliver a food plan that was customized for me and a team of associates who are all ready to assist. The Stark team is consistent, dedicated and focused on making a difference for each and every customer. Workouts that challenge me, make me sweat at every workout and make each workout rewarding. Seeing the difference in my body makeup, make each and every workout worth it! Don’t wait! Go for what you want with a support team that works with you.
Place rating: 5
Whittier, CA
Love this gym, my daughter came here last year & what a difference it made for her… Trainers & front desk so friendly always greeting you with a warm smile…& now I brought my son & he loved it & his trainer Brian, made him feel welcomed too…
Place rating: 5
Huntington Beach, CA
Dr. Jason Amstutz and his team completely set the bar for Chiropractic and Rehabilitation Treatment. I can honestly say I walk out of this office standing taller, more educated and always feeling better.
Suffering with Scoliosis since a very young age has caused severe pain and alignment issues. The corrections, adjustments and knowledge I have been given by Dr. Amstutz is hands down the first and only facility that has given me true relief and hope for a pain free life.
As good as it gets doesn’t really suffice in my opinion.
Place rating: 5
Huntington Beach, CA
This gym literally saved my life!!! I needed to lose some visceral fat, the fat around ur organs that you are supposed to have in order to protect them; which is like super hard to do, in order to get a surgery I needed to pretty much live. I went to the wonderful people at Stark and asked them to do the impossible, help me lose the fat while on a very restricted diet, physically very weak after already having two very invasive surgeries in three months, and they only had six months to do it. Needless to say, I am healthy, alive, and in the best shape of my life. They encouraged, pushed, and at times even carried me thru the hardest time of my life. My surgeon was astonished by my recovery from my 4 surgeries. he has been the top surgeon in his field for 17 years, and has never seen a patient bounce back like i have. You would be crazy, I mean absolutely looney tunes, to not train at Stark. They give you the tools to live a healthier and happier life, and support you while achieving any and all goals you set for yourself, even if they are impossible. I have learned that with tremendous and unconditional support, you can achieve anything you set your mind too. And I learned this from the people at Stark.
Place rating: 5
Newport Beach, CA
Oh stark… where do I even begin?! I LOVE this place! From the second you walk in– Tamara is an absolute doll and ALWAYS has a big smile on her face and greets you with such a warm welcome. Not only is stark and amazing gym in which I’ve had awesome results from but they have become family to me. The entire staff is so knowledgable and passionate it makes working out fun! I have never been able to stick to a work out before I came to stark, and now I actually get excited on my way in. Each work out is customized for their clients depending to what goals they wish to achieve. For me it was more defined arms and a healthier lifestyle– which I have absolutely achieved– I can’t say enough good things about this awesome place, you definitely get what you pay for– oh yeah, and a yummy shake after your workout! Thank you STARK– I love all of you guys!
Place rating: 5
Huntington Beach, CA
If you are looking for a place that will change your body, this is it! There are many personal training facilities out there, but this one is different. You will get the actual PERSONAL attention that you deserve. The workouts are designed for your body and your ability.
This place will challenge you, motivate you, strengthen you, and keep you on your toes. I love working out here because the trainers are knowledgeable and encouraging and the workouts change every month!
All you need is dedication and the results will come. The workouts are created for you, the diet is created for you, and the supplements are prescribed for you. Not everyone will be on the exact same program. This is why the results will happen if you train at Stark. Time can be as minimal as 2 workouts a week only 45 minute workouts.
Place rating: 5
Costa Mesa, CA
Where do i begin… lets start exactly 1 year ago. I was getting married in exactly 2 months and I was working out 6 to 7 days a week, sometimes 2 – 3 hours a day. whether it was back to back spin classes, yoga, pilates or just plain running in circles, I was doing it. Skinny right? ya not so much. Come to find out all the working out I was doing got me absolutely no where and was having reverse effects on me and my body. Stark help me realize that. They put me on a very specific customized diet, prescribed my supplements and had me training hard but only 3 days a week! when they told me my Workout schedule i was like… oh ya so I’m going to lose weight working out less… and no cardio… what were they thinking?! Now fast forward 1 year later and I’m in the best shape of my life! I’m down almost 20lbs and I have toned and tightened my body in places that i actually gave up on. Now my wedding dress is 2 sizes too big… hilarious. This has been the most amazing transformation and Im not stoping yet. Every month they change your program, new diet, new supplements and new workouts. Which means less and less clothing Ill be wearing to the beach! This is not a gym with personal trainers, this is not crossfit where you compete throwing around heavy weights with no supervision, this is a training center with some of the most amazing, educated trainers in the business, on staff doctor and muscle specialist, and most of all its family. This place has all the missing pieces to every program that has failed. And last but not least, Jesse Gawinske, my trainer, ROCKS! Im so thankful to have found Stark and I know ill be a part of this program for a long time.
Place rating: 5
Irvine, CA
Wow, where to begin. Starting with the care, Dr. Jay has been the most thorough and effective chiropractor I have ever received treatment from. From the intake process, to adjustments, to discussion and overall time spent, I am incredibly pleased. The most incredible outcome has been the resolution of a severe case of TMJ. In my first treatment, Dr. Jay adjusted my jaw — and I am not experiencing popping or clicking for the first time in almost 15 years.
And, my neck is improving with every treatment. I am very thankful for the quality of the care and total experience. Now I’m looking into the training side of things — to try to achieve total wellness. Thank you Dr. Jay!
Place rating: 5
Irvine, CA
I have been seeing Dr. Jay for about two months now. He has helped me finally begin to put an end to my migraines that have affected my life for over 13 years.
The Stark facility is pristine and outstanding, yet still small and not at all overwhelming.
If you want a personal trainer, need some rehab, or finally want to put an end to your pain go to Stark!!! They are stellar :)
Place rating: 5
Irvine, CA
I’ve been training at Stark for almost 60 days and the knowledge base of the trainers at this gym surpasses all other gyms that I have ever been too. Their methods are scientifically supported for the quickest results based on your specific needs. I personally dropped 3% body fat in 3 weeks after having worked out on a constant bases for years with just stable results.
I highly recommend this training facility for anyone who is looking for solid results that will be long lasting.
Place rating: 4
Irvine, CA
Brad (co-​owner of Stark) has created a fitness facility for those who are SERIOUS about a lifestyle change.
The methods are not fads or simple, quick fixes, but real, honest, and hard. The results depend on whether or not you can be committed not just to getting to a size 2 or benching 300 pounds, but to ultimately changing your life.
I love the trainers and everyone really is committed to helping you be the best you can possibly be… inside and outside of the gym.
Pros: 1. Everything is NEW. 2. The personalized showers make it easy for me to get in a good workout and get ready for work at the same location. 3. The personalized attention to detail Brad has at assessing your hormones, body fat, and health has helped me so much.
Cons: 1. You can’t schedule an appointment unless you call while the secretary is there. 2. You are not always guaranteed the same trainer. 3. You can’t access the appointment center online.
Place rating: 5
Newport Beach, CA
I first heard about Stark from someone I have great respect for. Though I was in good shape before working with Stark (5 days a week at a fancy gym, 3 days with a trainer), I figured I would at least go check out their operation.
I was immediately impressed with their attention to my specific goals, and current physical condition. When the initial assessment was explained to me, I knew they were professionals in a league of their own.
Another aspect of Stark which impressed me was that they regularly assess my progress. I can see the numbers, and I know exactly where I am.
After only a few short weeks, I was noticeably leaner, stronger, had much more energy, and slept better than I had in years. These were my initial goals which Stark got me to achieve, and exceed.
Place rating: 5
Irvine, CA
These trainers are wonderful! What a great group of people whom work together for the greater good of the client. I was pleasantly surprised by everyones’ demeanor and friendliness. Yes, they are there for you, however, they just happen to be a great group of people to be around. They care about results. I thought I was in decent shape before signing up at Stark and am now excited to see what my body has been able to do. I do the Svelte womens class 3x/​week and am seeing great results. Slim and toned — just what a girl wants!