Unlock the power of SquareFit™ Boxing – a revolutionary fitness system designed by World Champion Keith Johnson to build strength, stamina, and confidence for every body, every age.
Whether you want to lose weight, build strength, or improve overall health, our expert trainers will create a customized roadmap just for you.
Experience targeted workouts, nutrition guidance, and ongoing support that empower you to achieve lasting results and thrive on your fitness journey!
Our proven system at K3 Fitness Pro (Home of the revolutionary SquareFit Pro Boxing Method combines physical training with comprehensive boxing and the Law of the Square.
You get more than just workouts – you get a complete fitness strategy designed for lasting results.
I began my journey as an amateur boxer and went on to open one of the first personal training studios dedicated to boxing performance in the early ’90s. Since then, I’ve trained world champion fighters, Golden Glove Champions, and developed wellness and nutritional programs for corporations, designed personal training studios, and helped professional athletes reach their peak.
I founded K3 Fitness Pro, LLC, to bring a fresh and powerful approach to fitness and performance training. Through K3, I created Square-Fit Proboxing, a program that combines authentic boxing techniques with modern strength and conditioning to deliver real, lasting results.
Square-Fit PBC is the culmination of my life's work—fusing authentic boxing techniques with modern strength and conditioning science to achieve measurable results for clients at any level. This program is my legacy, and now, I’m passing it on to you.
When you join the Square-Fit PBC Certification Program, you're not just learning a workout—you’re learning a proven method from someone who’s lived it, taught it, and built businesses around it. If you're ready to stand out, build your brand, and lead high-impact training sessions that transform lives, I'm here to show you how.
Industry Leader: Over 30 years of experience in the fitness industry, specializing in boxing conditioning and athletic performance training.
Certified Expert: Holds multiple certifications in personal training, strength and conditioning, and sports performance coaching.
Proven Track Record: Successfully trained professional athletes, coaches, and fitness enthusiasts to achieve peak performance and certification in Square-Fit PBC.
At Square Fit Pro-Boxing
, we believe in the power of hard work. We pride ourselves on delivering visible results for all our clients. Whether you're training for a specific goal or just want to get into better shape, we’ve got you covered.
At K3 Fitness, we do more than train bodies—we transform lives. Our cutting-edge boxing-inspired training method, Square-Fit™ Pro Boxing & Conditioning, is rooted in the same techniques used by professional fighters, reimagined for every fitness level.
Whether you want to burn fat, build unstoppable strength, or gain confidence in and out of the gym, our programs are designed to meet you where you are—and take you further than you imagined.
And we don’t just keep Square-Fit™ in-house. We license and certify trainers, gyms, and fitness studios to deliver this one-of-a-kind program, helping them stand out in a crowded industry and create life-changing results for their clients.
From individual transformations to industry-wide innovation, K3 Fitness is where the next level begins.
Created and trademarked by Keith Johnson, Square-Fit™ is a one-of-a-kind system built on 30+ years of boxing expertise and real results you won’t find anywhere else.
Train like a pro without intimidation. Square-Fit™ adapts to all levels—with beginner-friendly modifications and advanced challenges for athletes who want more.
Square-Fit™ isn’t just exercise—it’s a movement. Build strength, confidence, and unstoppable energy that transforms your body and your mindset.
Explore how you can build the Square-Fit™ for your very own clients or open your very own Square-Fit™ studio.
Personalized Training Routines
Workouts designed for your body and goals, ensuring fast, effective results.
Expert Nutritional Coaching
Customized meal plans and advice tailored to your goals, whether it's building muscle or losing weight.
Progress Tracking & Accountability
Stay on track with regular progress updates, performance evaluations, and check-ins with your personal trainer.
Square‑Fit™ is a dynamic fitness program that blends the techniques of professional boxing with functional conditioning for all fitness levels. It’s designed to help you burn fat, build strength, improve endurance, and boost confidence—all while having fun in a high-energy, supportive environment. Whether you’re a beginner or an athlete, Square‑Fit™ makes training exciting and effective.
You’ll burn fat, build lean muscle, and improve stamina while mastering boxing fundamentals in a fun, high-energy setting. For fitness professionals, Square‑Fit™ provides a turnkey system to attract more clients, stand out from competitors, and grow revenue with a proprietary program that delivers results.
Unlike cookie-cutter workouts, Square‑Fit™ is rooted in real boxing techniques that develop coordination, confidence, and total-body strength. And if you’re a trainer, it’s more than a workout—it’s a business opportunity backed by a proven method, marketing support, and a licensed network.
Most fitness boxing classes focus only on cardio. Square‑Fit™ integrates real boxing skills, functional strength training, and progressive conditioning in a structured, proven format. It’s not just a class—it’s a complete training system that can be licensed by trainers and gyms to stand out from the crowd.
Yes—Square‑Fit™ goes beyond “punching for cardio.” It teaches proper technique, builds real strength, and conditions your entire body while still being fun and accessible. Plus, it’s the only boxing-based fitness system you can get certified in and teach anywhere in the world.
It starts with becoming a Certified Square‑Fit™ Instructor. Once certified, you’ll gain access to licensing options that let you teach the program in your gym, studio, or independently. You’ll also receive branding materials, ongoing support, and placement in our Trainer Directory to help you grow.
Yes! Square‑Fit™ is scalable for every fitness level. We offer low‑impact alternatives and modifications so beginners, those recovering from injury, and even athletes can train safely while still seeing results. Trainers are taught these modifications as part of the certification, ensuring every client feels supported.
Absolutely. While Square‑Fit™ is designed for all fitness levels, the techniques and conditioning are based on the training methods of professional fighters, making it an excellent foundation for anyone looking to compete.
Yes. Square‑Fit™ is rooted in the same movement patterns and conditioning protocols elite fighters use to prepare for the ring. It’s simply adapted so everyday athletes can safely experience the same benefits without needing fight experience.
Square‑Fit™ improves agility, coordination, endurance, and core strength—skills that benefit athletes across all sports. From basketball players to runners, its unique blend of conditioning and technique builds better performance and reduces injury risk.
Square‑Fit™ was created by Coach Keith Johnson, a fitness innovator and boxing specialist with over 20 years of experience training clients, athletes, and instructors. His mission was to design a scalable program that delivers professional‑level results for anyone, anywhere.
Coach Keith developed Square‑Fit™ by combining the conditioning principles of elite fighters with functional movement and accessible training progressions. After years of refinement, he built it into a structured system that can be taught consistently and effectively by certified trainers.
The personalized workouts and constant support from the trainers at Square Fit Pro-Boxing helped me achieve the results I always dreamed of. I feel stronger and healthier than ever!
I’m so glad I chose Square Fit Pro-Boxing for my fitness journey. Their expertise and dedication have made all the difference.
I’m so happy I chose
Square Fit Pro-Boxing for my fitness journey. Their expertise and commitment have truly made a significant impact.
Empower your fitness journey with Square Fit Pro-Boxing—where personalized training meets motivation and support.
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