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If you hire this pro, you’re covered by a money-back guarantee. Learn more
About
Hi, my name is Jack. I am a certified personal trainer with 15+ years of experience, and for years I had the exact problem most of my clients come to me with: I could build muscle just fine, but I had trouble figuring out how to get lean and keep it that way. Once I learned how to diet correctly, I’ve maintained 8% body fat with a six-pack, 365 days a year, ever since. Now I help lifters, active adults (men and women), and people with demanding jobs - including people in the trades and construction - do the same: build real muscle and get lean, without gimmicks, fad diets, or app-generated plans.
Every program is built by me personally, one-on-one, around your goals and your schedule. My clients have lost 30+ lbs and finally achieved the physique they’d been chasing for years. If you’ve put in the work, OR NOT, but still can’t see results, I can help!
Overview
Serves Los Angeles, CA
Background checked
1 employee
1 year in business
Business hours
This pro hasn't listed their business hours.
Payment methods
This pro accepts payments via Cash, Check, Venmo, and Zelle.
Customers rated this pro highly for professionalism, work quality, and value.
Exceptional 5.0
5 reviews
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Garet G.
Jul 30, 2026
Jack was super helpful in getting me back into shape after a few years of inconsistency. He setup a detailed workout plan and diet and checked in regularly to keep me on track with my goals. He even came to New England all the way from Cali to help me with an in person workout and made sure I was doing all the reps correctly etc. you won’t find a better trainer out there!
Adib K.
Aug 9, 2026
I’ve been working with Jack on my fitness goals for a couple of years now, and I can’t recommend him enough. He’s extremely attentive to detail and truly understands the science behind both nutrition and training. He’s also one of the most knowledgeable people I’ve ever met when it comes to working out, proper lifting technique, and understanding how to train effectively.
What I appreciate most about Jack, though, is his honesty and flexibility. He really listens to each person’s individual goals and understands that fitness shouldn’t come at the expense of enjoying your life. His priority is helping people feel good throughout their journey rather than pushing them toward extreme or unsustainable approaches.
A lot of people can make progress by sacrificing too much for a short period of time. Jack takes a different approach, he helps you build healthy, realistic habits that actually fit your life and can be sustained for the long term. That’s what really sets him apart.
Mac F.
Jul 29, 2026
I had a great weight loss/muscle building journey through Jackson’s fitness. I lost over 25-30 pounds in about 4 months or so. It was much more fun and easier than I had thought it would be. I learned great tips from Jack on a variety of different exercises as well as how I should shape my food plan. I was tired of trying and failing with many other weight loss programs but Jackson’s fitness really came through for me. 💪🏻
Joe F.
Jul 30, 2026
I have nothing but great things to say about being apart of Jackson’s Fitness. From the start we had come up with goals and accurate plans to accomplish the body that I’ve always desired. Having the assistance of Jackson’s Fitness I’ve finally been able to achieve my goals and better yet that knowledge is now all at my fingertips. Thankyou so much Jackson’s Fitness💪
Matt D.
Jul 30, 2026
Working with Jackson’s Fitness has had an immense impact on my fitness journey. I feel that Jackson’s Fitness excels at genuinely investing in their clients. You are not a number and that makes all the difference when it comes to results. Highly recommend!
Credentials
Background Check
John Finnegan
FAQs
What should the customer know about your pricing (e.g., discounts, fees)?
I offer monthly, 3- month and 6-month coaching packages, with no long-term commitment required on the monthly plan. Longer packages come with built in discounts, including a free final month on the 6-month program. In-person sessions are available as an optional add-on for local clients. For exact pricing based on your goals, fill out my questionnaire and we’ll cover it all on our call - that first conversation is free.
What is your typical process for working with a new customer?
When a new client reaches out, we start with a short questionnaire covering your goals, training experience, schedule, and importantly - what foods you actually enjoy eating, since that’s a huge part of building a diet you’ll actually stick to. Once that’s complete, we hop on a one-on-one ********** to go over your answers in detail and make sure we are a good fit for each other before moving forward.
From there, I build a fully customized workout and nutrition program tailored specifically to you - nothing app-generated or copy pasted. Once you’re set up, we stay in close contact through regular check-ins (daily and weekly depending on your plan) so I can track your progress, answer questions and adjust the program as needed. My goal isn’t just to get you results short term, but to teach you habits that last well beyond our time working together.
What education and/or training do you have that relates to your work?
I am a NASM certified personal trainer with over 15 years of experience in fitness. I was a competitive athlete in college (baseball), which gave me a strong foundation in training methodology early on. I’ve also been personally trained and mentored by two professional coaches, most notably Eric Cressey, one of the top strength and conditioning coaches in the country.
Beyond formal training, a lot of my expertise comes from real world experience - including years spent figuring out, through trial and error, how to actually diet correctly to get lean without losing muscle. That hands-on knowledge is something I bring directly into every program I build.
