Jason is an excellent trainer. My wife and I have both used him to build strength and provided specific routines for our age and needs. He works with you at whatever level you're at and is considerate of your health and limitations. I highly recommend him! read more

I've been a member of a local gym in El Segundo for a good 2 1/2 years. Although I never had a one on one training with Jason, I will say that he is always giving me tips and pointers on how to better use the equipment and have correct form (so very important). I've watched him work with several people during the time that I've been there and I should really book some sessions with him because WOW, the transformations I have seen are pretty great. I'm very impressed with his coaching, his knowledge, and his methods. I highly recommend contacting Jason if you're looking for a trainer!! read more

Jason is great! Extremely knowledgeable about physiology and form, able to tailor workouts to your individual needs and goals, and he's always up to date on the latest studies and research to train your body most effectively. I've been working out with Jason for several years now and the progress I've made speaks for itself. read more

I've been lifting pretty seriously for 15+ years and I only wish I found Jason sooner. His knowledge of mobility, stretching, technique, and form is exactly what I needed. I feel like I'm getting a "tune up" which has already resulted in pain relief after just a couple sessions. Highly recommend!!! read more

I've been a member of a local gym for the last few years. Working out there provided me with an opportunity to regularly observe Jason train clients across a wide range of fitness levels. I've been impressed with the focus and attention Jason provides to every client. I have also seen him assess the capabilities and limitations of new clients as they work together and build a personalized training program designed to reach specific goals. My wife recently retired and wanted to dedicate some of her newly available time to improving her fitness. I suggested she give Jason a try. She's been training with Jason now for nearly five months. She is reaching her goal to lose fat and gain strength. She looks more fit, is 10 lbs lighter and is stronger now than she has been in years. If you're serious about increasing your fitness and are looking for a no nonsense trainer, to help you reach your goal, I recommend Jason! read more

I just completed my 2nd DEXA scan to track progress. After completing 12 weeks of my program that Jason put together for me, I am seeing body fat % loss and my clothes fit much better/more loose. Several people complimented me at my gym including a trainer telling me that I look leaner. Someone commented two weeks ago that I look significantly leaner and as a result also younger. I am very happy about my progress. read more

Jason is the real deal. An experienced, thoughtful, and forward-thinking physical trainer who sets his clients up for success with his expertise and motivational abilities. Jason put together a training plan tailored to my specific goals and remained invested in my progress, weeks after our private sessions had concluded. Jason has also lived a life and has great stories about his years in the business. Whether you're looking to begin your fitness journey, or take it to the next level -- this is your guy. read more

Jason is very knowledgeable and is dedicated to making sure your form and alignment are correct with every exercise. He does an initial assessment and personalizes the workouts to your specific needs and goals. Jason also makes every workout fun and enjoyable. If motivation, professionalism, and a personal approach is what your looking for in a personal trainer, then Jason is the one for you! read more

I've been training with Jason for almost 3 months now, and he is one of the most experienced & committed trainer I have worked with. I started training twice a week, i really enjoyed the variety & challenge he put into each sessions. Jason is focused on helping me achieve my goals and he makes each of my training sessions challenging but rewarding. My fitness has increased noticeably and I've seen improvements in my ability to complete more sit ups / core exercises, Squats, lift progressively heavier weights & generally push myself harder throughout each session. I find I actually look forward to my workouts. Importantly: - He ensures that my technique is always correct to avoid any injuries. - He is extremely reliable & punctual - always set up & ready to start training ahead of time, with an exercise routine planned. He is an AMAZING trainer, highly recommended! read more

I started training with Jason about 6 weeks ago and I am amazed by the results I am seeing. I have gained muscle tone and my overall fitness level has significantly improved. This week I was pleasantly surprised to notice that I had lost 5 lbs since I started training with Jason - no diet, just by training with him twice a week! I especially appreciate how much attention he pays to injury prevention. As someone with chronic lower back problems I need a customized program that does not aggravate my back issues. Jason is super knowledgeable about how to build a program that not only prevents aggravating my back, but also focuses on systematically improving my areas of weakness. I appreciate how detail oriented and observant he is. He pays super close attention to my form and often makes the smallest of corrections to make sure an exercise is done with maximum efficiency and safety. I also like that he takes detailed notes to monitor my progress and makes sure I am always improving. I always look forward to training with Jason because he makes it challenging, but in a fun way. I am not someone who would ever do weight training on her own. I have zero motivation but I know it's good for me and I need to do it for health reasons. Working out with Jason 100% takes care of my motivational deficit. I know as long as I meet with him I will get an amazing workout. I would never push myself as hard as I push myself during our sessions. And the results speak for themselves. read more

Jason is very professional and extremely knowledgeable. He clearly understands his clients needs and designs a program that is meets their goals while being sensitive to avoiding injury. I highly recommend him as a trainer.l! read more

Jason is a great coach and trainer because he puts his client's needs first and foremost. He has a depth of understanding in body building and strength training that allow him to customize training plans and respond to what works best for each client's body. I highly recommend him. read more

Update: For the first time in sooo long - 15 years, I have muscle on my legs! I so appreciate how Jason always puts my goals first and is always on my side to help me win! He is so worth it! read more

After a couple of moves, working out with Jason in person was unfortunately not an option for me anymore. But I reached out to him anyways because I knew he could help in some way. I had been going to gym and trying to loose weight for months. I was seriously stuck and not making any progress on lowering my body-fat % or progression in my workouts. Jason wrote me a gym program AND nutrition coaching. I send him videos of my form and he lets me know how I can improve. I have been increasing my strength incrementally and genuinely enjoyed his program/ going to gym! As far as the nutritional coaching Jason has been the key piece I have been missing. I have lost 3 pounds already, which would normally take me months!! Since i am already in the average weight range. I am very gratefully to have Jason as my health and fitness coach. I still highly recommended reaching out to him if you have been stuck, are new to this journey or simply want to try something new. If you want results and put your trust in him and do what he says, you will get them! read more

JK Physical Culture - Nutrition coaching- at your fingertips!! - Trainers Near Me

Jason is an amazing trainer. At 64 years old I have always been in pretty good shape but he definitely got me to another level. Was having back and hamstring issues. In a few sessions he got a program together for me and straightened me out. Back to playing beach volleyball pain free! Highly recommend Jason for any and all training read more

I've known Jason for a couple years now. I've worked with multiple trainers in the last five years and as my knowledge has progressed (I had no experience prior) my expectation of what I want in a trainer has as well. If my level of training was compared to education levels, where I began was high school/elementary, training with Jason is like getting a DOCTORATE education. Not only do I love the workouts but my energy levels and confidence outside the gym has improved ten fold. At this point not only do I want to know what we are doing, I want to know WHY. Jason is great at explaining the what, why, and how of what we are doing. Plus bottom line Is he's just cool. I couldn't imagine having to work with someone week over week that I couldn't stand. Give him a call...you'll get more than you could ask for. read more

The real deal. Felt like I got a MasterClass on getting the form right for the workouts.

If you're looking for someone who knows everything there is to know about the body, how it works and how to make it better -- J.Kahn is your man. As a fellow personal trainer he has opened my eyes to how each training program can vary while finding the right fit for each individual. I'm honored to call Jason a colleague, friend and mentor. read more

I started working out with Jason 4 months ago and was just had an updated Dexa scan completed today. In just 4 months of working with Jason I have gained 8 pounds of muscle and lost 2 pounds of fat! My weight is unchanged from when I started working out with Jason. My diet has been mostly unchanged the past 1-2 years. These gains are due to Jason's great programming. Workouts are literally 1 hr a day, 4 days a week. Sign up with Jason, he knows what he's doing and his programming works! read more

I have known Jason for over 17 years. He is very committed to his clients and is a great partner to help you achieve your goals. You will work hard, but the results are worth it and he has a great sense of humor which helps to make things fun! SoCal, you are lucky to have him! read more

Brothers and sisters Jason has put me to the test one more day fantastic trainer I highly recommend him to help you find limits push them and increase your impossible he's the man with diet and your physical fitness becomes next level. I so highly recommend him read more

Jason I just want to thank you for all your help, coming to my house and train me is really helpful to me as I have a very busy schedule, to me you are the best! You are really helping me from scratch and teaching me the right way of working out you are the most patience and yet strict trainer in my eyes you are the best ... thank you so much I just hope one day to have your six pack and small waist! Thank you Jason!! read more

I've known Jason for over a year now, and I have to say he is one of the BEST trainers that I have ever experienced. Ever. What can I say about Jason? What makes him stand out amongst all the other trainers and so called experts? Several things. First, he's knowledgable. He actually spends his free time staying current on fat loss and muscle hypertrophy research. Better than that, he shares his knowledge with his clients! If you're the type of person who wants to enter the gym and do what your told, you can do that and you'll be happy. BUT if you're like me and you want to know the WHYs of what you're doing, Jason encourages that! He wants his clients to be full participants in their progress, on every level. Second, FORM IS KEY in his book! He will make sure that each and every exercise is done with proper form and he'll stop you if he sees form breaking down. Why is this important? Well, we're all training to look better and feel better, right? I'm a 38 year old mom of two. I don't have time for injuries in my life. I want results that are SAFE! Jason is a stickler for form and mastery. This doesn't mean you'll be working with the 2lb weights everyday. This means that you'll progress in weights and reps and overall time under tension at a rate that is safe and specific to YOU and that will keep you getting leaner and stronger for a long time to come. As a former athlete, it's so important to have someone that nudges me to keep all of this in perspective. Lastly, he walks the walk. I mean this guy looks AMAZING!! That should be a no-brainer but unfortunately there are trainers that haven't mastered their own fat loss and physique goals. Why in the world would you want to train with someone like that? Ok, last point: He's a nice guy. Not super gabby, so he won't spend the entire session running his mouth. Instead he's a quiet firm presence that will give you the reassurance that he knows what he's doing and will get you where you need and want to go! read more

I started working with Jason after relocating from Minnesota to the South Bay Area, because I wanted some guidance on switching up my workouts, as I had gotten into a rut repeating the same exercises for some time. Being a personal trainer myself and having used many trainers over the years, I feel very fortunate to have found him at my gym. Jason is EXTREMELY knowledgeable and passionate about training and has helped me tremendously improve my workouts and how to focus on the subtle nuances that make all the difference in each exercise. Of the many trainers I have used over time, I've only met one other with as much knowledge and passion as Jason. Every workout feels like a deeper education in personal training. Highly recommend!!! read more

Jason is a consummate professional. He was very very thorough in his assessment of my current physical condition and listened very intently on what my goals were. He is 100% committed to me making sure I achieve my goals safely and for that I am eternally grateful. Working with someone especially on something as important as your physical health, it's really important that you can trust them without reservation and I have the utmost confidence in his judgement. He made it clear that my needs came first he was there to support and also encourage me using his deep and broad knowledge of the body systems and nutrition. Without any reservation I would recommend him to someone that I don't know and I have already recommended him to many of my friends who are looking to maintain and enhance their physical health. When you find someone that you trust with your physical health don't ever let them go. I plan on seeing Jason until either he's at my funeral or I'm at his :-). read more

I play sports and have been for many years. Due to the wear and tear of sports, I have needed additional help specifically on my legs. Jason has been very helpful to get me past a lot of injury pain and lagging soreness. He recommended stretching and other exercises along with rollers and it is definitely helping! with his great knowledge base, he brings a lot to the table. Definitely will go back again! read more

I've known Jason for a few years now and am very impressed with his approach on physical fitness and nutrition. Jason has an extensive background and knowledge in physical training and nutrition which he custom fits for each of his clients needs. I've been following his tailor fitted program for three months now designed for my specific goals and have surpassed what I thought was possible. staying healthy, not overworked and felt amazing throughout the whole program. My numbers prove it. I even recommended him to my mom who has neck and spine issues. He designed a program for her which has dramatically improved her quality of life and fitness. I highly recommend a session with Jason and without a doubt you'll be impressed with his approach. read more

I own the 4 Star Gym where Jason trains his clients. Jason has been training his clients at 4 Star for over 3 years. First, Jason is extremely qualified. He has a BA in Kinesiology and is CSCS certified with over 29 years of experience training people from all walks of life and different goals. From watching Jason train his clients and witnessing the incredible results his clients achieve, I feel very grateful that Jason chooses to train them at 4 Star Gym. Beyond his education and certifications, Jason is constantly educating himself on the most current fitness and nutrition concepts. Most importantly, Jason emphasizes form and safety in training his clients, which has resulted in not one client suffering an injury during training. Because of this and the results I have seen Jason's clients achieve, I am enthusiastic in recommending to my new gym members that they consider training with him. From a gym owners perspective what I really appreciate about Jason is how he conducts himself and his calm assertive, but enthusiastic presence. This is so important, because he creates an atmosphere within the gym that is welcoming, safe but also conveys to his clients that we are here to accomplish something. read more

If you're looking for a trainer look no further Jason is the Best. With his busy schedule of training people in the gym he still has time to travel to my gym in my condo complex in Beverly Hills to train me. He not only has helped me in the gym with my form and strength training he has educated me in supplements, food choices and recipes. Jason has inspired me to live a healthy balanced life in and out of the gym! read more

Jason is the best! He's pretty much the nicest guy you'll ever meet and super knowledgeable. Before this I had never worked out at a gym ever and was pretty anxious about the prospect of it - not knowing how any of the machines or exercises done. Jason breaks it all down- stressing proper technique and stretches to offset my sedentary software lifestyle. He super knowledgeable about diet too and talking to him about this is like a drinking from a fire hydrant. ha It's only been a little while, but I'm already seeing results! I highly recommend! read more

I have known Jason since working with him a few years ago, his commitment to your achieving your goals is his priority, he has great knowledge of fitness and workouts to get you results! I recommend training with Jason if your serious about your health goals and want results, he made a huge difference in my life sharing his knowledge with me, great Trainer! read more

Jason has helped me an incredible amount when it comes to strength training and mobility. I feel like I learn something new every time I train with him. Some of the tips he's taught me have helped me cut down on recovery time and perfect my form in power lifting movements like the deadlift and squat. He's a true professional and is great to work with. read more

Jason is an amazing trainer who has a vast knowledge on every topic from powerlifting to diet to mobility. He is an extremely well rounded trainer who can give you advice from every single angle in the art of getting fit. The first thing I noticed when training with him is that he gets me to lift in perfect form. Jason always explains the reasons for the movements I do and how it will develop me. I really enjoy the workouts and he expertly tailors my workouts based on what my goals are. He really is an exceptional trainer. If you're looking for a trainer to help you gain weight, lose weight, get stronger, build muscle, increase agility, or any physical goal, Jason has all the tools to make your goals happen! Highly recommended. read more

Having worked with Jason for several months now, I can safely say he is one of the kindest and most impressive fitness professionals I've met. His knowledge of various exercise modalities is certainly extensive, but it's his ability to convey and implement that knowledge that makes him stand out. I've benefited greatly from Jason's advice and know that no matter where you are on your fitness journey, you will too. read more

I've been working out with Jason off and on for the last several years. He knows what he is talking about when it comes to strength training, form, nutrition and more. He explains each move so you understand why you are doing it and how it will benefit you. I feel stronger and more confident when at the gym and he constantly challenges me and won't let me give up. I highly recommend Jason when you are ready to get serious, put in the work and are ready for real results. read more

I've known Jason for 10+ years and my training session with him was invaluable as he provided me with advice on how to properly and safely train with weights. He has years of experience in fitness and a background in martial arts, which was a plus in understanding the many facets in how the body functions. I highly recommend! read more

I have known Jason since 2008. I highly recommend him as a trainer and all around health coach. He knows how to create personalized fitness programs for you to reach YOUR specific goals... whether they pertain to diet, strength, or functional ability He continually adjusts your workouts so you keep seeing gains and keep engaged. He is also an expert in diet, nutrition, and all things health related. For him, it isn't his job, it is what he was born to do and is truly interested in. He stays current and knows the difference between scientifically proven health research and nonsense fads. read more