TRAIN LIKE A CHAMPION
UNDERGROUND KINGS MMA
Home to world-class legends like Eddie Alvarez, our adult programs offer elite coaching and purpose-driven training—whether you’re stepping into the sport for the first time or leveling up your skills. Our programs include MMA, Jiujitsu, Striking, and Russian Sambo. Explore all below.
ADULT MMA - Underground kings
Respect. Discipline. Confidence. These values help create a positive experience for everyone, no matter their background or skill level.
This ties in perfectly with Eddie Alvarez’s “Underground King” philosophy: an Underground King isn’t defined by belts, money, or glory—it’s about behavior—discipline, humility, diligence, and a relentless work ethic. In other words, you’re a champion long before the world recognizes it; the titles and accolades are simply by-products of living like a King.
Transform Your Fitness with Underground Kings
Our Adult MMA Program is perfect for anyone looking to train like a true mixed martial artist, develop real-world self-defense skills, or enhance their abilities for law enforcement, first responder, or military roles.
Led by professional MMA fighters, this program combines the techniques from our Jiu-Jitsu and Striking programs into a seamless, effective fighting style. The focus is on technical, safe instruction — ideal for beginners and for those seeking to sharpen their skills with precise, professional coaching.
This program is open to all members currently enrolled in Striking and Jiu-Jitsu classes. Please note: there is no live sparring in these MMA classes. Students interested in sparring should speak directly with their instructor.
Not Sure You Have What It Takes?
Think you need martial arts experience to join an MMA gym? Think again. At Underground Kings, everyone is welcome — no matter your background.
Our programs break everything down to the basics, helping you build confidence and develop skills step by step. Start with beginner-friendly Jiu-Jitsu or Striking classes, then progress at your own pace.
Whether you’re brand new or have prior experience, you’ll find the support, instruction, and community to help you succeed.
See our schedule and programs below!
Interested in Joining Underground Kings?
Come by and check out the facility anytime. We offer FREE trial classes for most of our programs. However, the MMA Program IS NOT AVAILABLE FOR THE FREE TRIAL.
ARE YOU A PRO OR HIGH LEVEL FIGHTER ALREADY?
Come by NPI anytime and ask to speak with Erik Purcell directly about your training and pricing options.
Head MMA Coach: Erik Purcell
Assistant Coaches: Justin Burke, Yohannes Habtu, Johnson Jajoute, Gordon Wigington
We run full fight camps for our Pro & Ammy athletes. On staff we have Strength & Conditioning Coaches, Specialty Coaches, Full MMA Cage, Boxing Ring & more.
ADULT Jiujitsu
Train with Champions: Elevate Your Jiu-Jitsu Game at NPI
Our Brazilian Jiu-Jitsu Program is led by 2nd Degree Black Belt Erik Purcell, Black Belt Pat Sabatini, and World & Pan Am Champion Jillian Peterson. This is a high-level program open to all skill levels, offering both Gi and No-Gi classes, as well as dedicated BJJ Fundamentals sessions.
MPR is an officially recognized Black Belt Academy by the IBJJF. In addition to Jiu-Jitsu, we also offer specialized grappling disciplines such as Russian Sambo and Wrestling.
Jiu-Jitsu is one of the most respected martial arts in the world, known for building strength, flexibility, self-defense skills, and mental discipline. Students will learn submissions such as chokes, armbars, and triangles, along with essential positional control and defensive techniques.
To participate in our Gi program, students must have a regulation Jiu-Jitsu Gi, which can be purchased through us or brought from home.
See our schedule and programs below!
Interested in joining our JiuJitsu Program?
In our program, you will learn valuable self-defense skills such as how to subdue an attacker, defend yourself while pinned on the ground, escape vulnerable positions, and apply effective submission techniques. You will also experience the sport side of Jiu-Jitsu, where points and submissions are used to secure victory over an opponent in competition.
No previous experience is required. We welcome all ages, genders, and skill levels. Please check our class schedule for specific days and times.
NPI Competition Team
The NPI Competition Team represents excellence, hard work, and the pursuit of being the best. This hand-picked team of students does not just compete, they compete to win. Members train with focus, sacrifice, and a drive to excel both individually and as part of a team.
Team selections are made annually, and only the most dedicated athletes are invited to join. Active high-level competition is required for consideration.
ADULT Striking
Elevate Your Striking
Tired of the same boring workout routines and lackluster results? Join the NPI Coaches and experience a striking program like no other. Our classes cover a variety of striking combinations, including kicks, punches, elbows, and knees, while teaching essential self-defense skills.
Led by professional fighters and instructors, this is real deal striking instruction - not cardio kickboxing. We combine the best of Muay Thai, Boxing, MMA, and martial arts to deliver a well-rounded system that works. Each session is designed to improve your skills, fitness, and confidence.
What to Bring:
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14 oz or 16 oz boxing gloves
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Mouthguard
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Shin guards
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Gym shorts or athletic wear (thai pads provided)
Be prepared and on time for class. Without proper gear or punctuality, you may not be able to participate. Check your location’s schedule for class times and join us on the mats for authentic striking technique and conditioning.
Meet Our Certified Striking Instructors!
Instructors Certification: Must have helped corner a minimum of 2 fighters & must be at least a Level 4 certified athlete to test. Also you must help as an assistant coach for at least 20 classes minimum (Adult or Junior).
Certified MPR Striking Instructors:
Johnson Jajoute
Gordon Wigington
Yohannes Habtu
Chris Pop
Patrick Sabatini
Justin Burke
NPI Striking Levels
Level 1 – You will learn the fundamentals of Striking and pad holding. No sparring
Level 2 – You will learn more advanced drills, combos and striking techniques. Supervised technical sparring is allowed.
Level 3 – Students that have passed Level 2 testing and in addition have been approved for unsupervised sparring.
Level 4 – You are expected to be able to execute most or nearly all techniques comfortably while sparring.
Level 5 – This is the equivalent of getting your blackbelt.
ADULT Sambo
The United States Sambo National Training Center
At NPI Endurance in Newtown, PA, we are proud to be the official U.S. Russian Sambo National Training Center. Whether you're looking to compete or enhance your skills, our world-class coaches are here to guide you in Russian Sambo.
What to Expect in Our Classes
Join our Sambo classes with your Gi or Kurtka and learn from the best in the field.
- Classic Techniques: Train in Judo pins, footwork, and throws.
- Grappling Mastery: Sambo is part of our NPI Grappling Membership, providing access to a wide range of grappling skills and techniques.
- No Extra Equipment Needed: Only a Gi is required to take part in our Sambo classes!
At NPI Endurance, we combine expert coaching, high-level athletes, and a supportive training environment to bring out the best in each student. Whether you’re aiming to compete or simply want to develop your grappling skills, our Sambo program is for you.
Why Train Sambo at NPI Endurance?
Our Sambo Program is designed for athletes seeking to compete at a national or international level, or for those looking to incorporate this dynamic martial art into their existing skill set.
International Success: We currently have five athletes who actively compete on the USA Sambo Team, representing the U.S. at competitions both nationally and internationally.
Comprehensive Training: Our classes cover the full range of Sambo techniques, including Judo-style chokes, pins, footwork, and throws seen in Olympic-level competitions.
We offer Sambo at all NPI locations, led by an elite team of coaches including:
- Mikhail Kozitskiy – International Coach, USA Sambo & Master of Sport Coach
- Erik Purcell – USA Sambo Coach and National Sambo Champion
- Bob Clark – Expert Sambo Coach
Our program is ideal for athletes looking to master Russian Sambo or improve their skills in BJJ, MMA, Judo, or Wrestling.
Got any questions about our programs? Give us a call! We would love to help you discover the best program to help you achieve your goals.
Train like a CHAMPION
Led by former UFC and Bellator Champion Eddie Alvarez, the MMA program offers world-class coaching in a welcoming, family-oriented environment. With access to elite instructors—including 4x welterweight boxing champion The New Ray Robinson—members of all ages benefit from a full suite of classes and championship-level instruction.
MMA TEAM
MMA TEAM
Join our elite MMA team and compete at the highest levels of the sport. Train alongside dedicated teammates who share your passion and drive, and receive personalized coaching and support from our experienced staff as you strive to achieve your competitive goals.
PRIVATE TRAINING
PRIVATE TRAINING
Elevate your game with personalized private MMA training. Our expert instructors tailor sessions to your goals, focusing on striking, grappling, and more. Experience accelerated progress and achieve your martial arts aspirations with one-on-one guidance.
CLass Schedule
Not Sure About Commiting to a Class? Try One For Free! Email DougSharp@NewtownAthletic.com to learn more.
FAQS
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