“Jon is an incredible trainer and just as good a person, which should also be important when working with someone 1:1. Jon is enthusiastic about fitness but doesn't make training hard to understand or too complicated. He is supportive and humble in the way he explains his exercises and how they will change your body. He is \"at your level\" in terms of his attitude which means he has broad appeal, whether you are just starting your fitness journey, or have been training for a long time. His breadth of knowledge is also awesome! He knows his Plyo, Cardio, Weight Training and HITT exercises and can also teach and encourage boxing which I found exciting! As I started by saying, Jon is an all-over great guy with incredible fitness knowledge. We should all be so lucky to find a trainer like Jon who encourages, listens and supports his clients to achieve their fitness goals.”
Finally, a gym that actually cares if you show up.
Kickboxing • Strength • Mobility.
8 people per class MAX — essentially personal training with a few friends. Real coaching, accountability check‑ins, and adaptive programs that fit your busy life. Zero cliques. All results.

Small classes. Big results. Zero cliques.
We built Fire Inside Fitness for busy professionals who want expert coaching, accountability, and a community that actually feels good to be around.
It’s basically personal training—with a few friends. Real 1:1 attention and feedback every session.
We notice if you miss. We follow up. We adapt your plan so you keep winning.
Injuries or pain? We design sessions around your body so you can train pain‑free.
No mean‑girl vibes. No ego lifting. Just your new Fire Tribe.
Choose your starting path
Kickboxing – Free Trial Class
Personal‑training energy in a small group: beginner‑friendly mitt work, bag rounds, strength and mobility in one fun session. Real technique. Real sweat.
Strength & Sculpt – Free Trial Class
Coach‑guided small group—joint‑friendly strength circuits to build lean muscle and support everyday performance.
1:1 Personal Training — Consultation
Private coaching tailored to your goals, injuries, and schedule. Perfect for busy pros and anyone who wants hands‑on guidance.
Quick answers
Nope. We coach technique from the ground up and scale each drill to your level.
We adapt every session. Pain‑free progress is the goal, not pushing through pain.
8 people per class MAX—basically personal training, with a few friends.
2–3x/week is ideal for momentum. We’ll map a plan and check in to keep you on track.
What members say
“John trained my travel baseball team for several seasons. He was very organized and kept the players engaged from week to week with new challenges, pushing them to strive for their best. John was also a personal trainer for my son, on a one to one basis. My son has become a highly competitive college wrestler who also inspires to do personal training one day. I am forever grateful for the inspiration John gave to my players and also my son. He is highly recommended...”
“Fire Inside Fitness is a great option for anyone who is looking for a custom approach to meet their goals. Whether you've had some health issues, injuries, or just not seen great results with cookie cutter gyms you will love Coach Jon's approach. He's attentive and constantly adapts your programming to suit individual needs. Highly recommend!”
“Ive trained with Jon for many years, absolute gem of a person to work with. Beyond patient and takes his time to work with you.”
“I’ve been training at Fire Inside Fitness for a few months now, and I have to say, Jon is an exceptional coach! His expertise and passion for the sport are evident in every class. Jon’s coaching skills are top-notch; he breaks down techniques in a way that’s easy to understand, no matter your skill level. He’s incredibly supportive and always pushes you to be your best, while making sure that everyone has a great time. The classes are intense, but Jon’s enthusiasm and sense of humor make them so much fun. If you’re looking for a kickboxing gym where you can learn from the best and enjoy every session, I recommend this one.”
“Jon is a great kickboxing coach! My husband and I hate working out with a passion, but truly enjoy Jon's classes and really work up a SWEAT. He is really committed to helping better every person in his \"fire tribe\", and is a genuinely great guy!”
Meet Coach Jon Shapiro
Owner & Head Coach. NASM‑certified since 2010 with specializations in MMA Conditioning and Behavior Change. I build adaptive programs that help you get strong, lean and pain‑free—without feeling judged or lost in the crowd.
Visit the Studio
Fire Inside Fitness LLC
415 Howe Ave, Ste 4110S
Shelton, CT 06484