About
Us
Our Mission
At Extreme Speed Training, we believe greatness is built through discipline, hard work, and elite coaching. For over 27 years, we have been developing student-athletes across Phoenix, Arizona, helping them become faster, stronger, and more confident both on and off the field.
Led by former NFL player Reggie McGill, our coaching team brings real-world experience from the highest levels of competition. With backgrounds in football, baseball, track, soccer, tennis, and softball, our staff understands what it takes to compete and succeed in today’s demanding sports environment.
But experience alone isn’t enough — passion drives everything we do.
Our coaches are former athletes and dedicated performance trainers who specialize in Speed, Strength, Agility, and Conditioning. Every athlete who trains with us receives personalized, high-level instruction designed to push limits, sharpen skills, and unlock true athletic potential.
We work with young athletes at every stage of development — from beginners learning the fundamentals to advanced competitors preparing for high school, collegiate, or elite play. Our programs are built to improve performance in any sport while building discipline, resilience, and confidence.
At Extreme Speed Training, we don’t just train athletes —
we build competitors, leaders, and champions.
Whether your goal is to improve overall fitness or dominate your sport, our team is committed to guiding you every step of the way!
Coaching
Meet Our Team
Co-Founder and Extreme Speed “OG” Reggie McGill
Reggie McGill was a standout high school athlete, earning Parade All-American honors and the distinction of having his jersey retired. He went on to become a four-year starting running back at the University of Arizona, where he majored in Exercise & Sports Science, fueled by his lifelong passion for physical education and coaching.
After pursuing opportunities in the National Football League, Reggie transitioned into education, becoming a certified high school P.E. teacher and earning his Master’s in Secondary Education. In 1997, he co-founded Extreme Speed Training, dedicated to developing young athletes and helping them reach their full potential.
Over the past 15+ years, Reggie has helped nearly 100 athletes earn college scholarships. His mission has always been simple: give back to the next generation by combining elite athletic training with mentorship, discipline, and education.
Co-Founder
Karlas Mauzy
Karlas Mauzy, co-founder of Extreme Speed Training alongside Reggie McGill, has been developing athletes across the Valley of the Sun for more than 20 years.
A former Mr. Arizona, Mr. Southwest America, and Mr. Mid-USA bodybuilding champion, Karlas combines elite strength training with sprint performance coaching. He holds a Bachelor’s degree in Criminology and has earned four Black Belts across multiple martial arts disciplines, bringing discipline and technical expertise to every athlete he trains.
Over the years, Karlas has worked with athletes from numerous Arizona high schools and colleges, helping them build speed, strength, and competitive confidence. Beyond athletics, he also serves the community in the mental health field as a Program Coordinator for New Horizon Youth Homes, where he manages West Valley group homes and mentors young people toward positive futures
Sr. Trainer
Michael Richmond
Michael Richmond is a former standout athlete and experienced coach with a strong background in football and track. A two-time Arizona state football champion at St. Mary’s High School, he earned a full scholarship to New Mexico State University, where he competed as a wide receiver and track athlete while earning his degree in Justice Studies.
Following college, Michael played three seasons with the Arizona Rattlers in the Arena Football League**, gaining valuable professional experience.
Michael began his coaching career in 2010 at St. Mary’s High School, and in 2011 coached sprinters at Chaparral High School. In 2014, he helped lead Salpointe Catholic High School to an undefeated season and state championship.
With over 15 years of athlete development experience, Michael brings elite-level knowledge, leadership, and passion to Extreme Speed Training, helping athletes maximize their speed, strength, and performance.
Trainer/Early Athletic Development
RJ McGill
RJ McGill is a former standout multi-sport athlete from St. Mary’s High School in Phoenix, where he earned 1st Team All-State Running Back honors and was named 5A Two-Way Player of the Year.
He went on to receive a Division I full-ride scholarship to the University of North Dakota, where he was a four-year starting slot receiver and scholar-athlete, graduating with a degree in Communications while maintaining a strong academic record.
With over 10 years of experience training young athletes, RJ brings energy, leadership, and a powerful mindset to every session. His mission goes beyond sports—inspiring athletes to build discipline, confidence, and become the best versions of themselves both on and off the field.
Follow RJ for motivation and training inspiration:
Facebook: www.facebook.com/rjmcgill07
Extreme Speed Training: www.facebook.com/ExtremeSpeedTraining
Trainer/General Manager
Brad Bengtson
Brad and Reggie first connected in 2006 when Reggie began training Brad’s son Brendan and his football team. In 2008, they formed a short business partnership that included the early stages of Extreme Speed Training.
Before joining Extreme Speed Training, Brad was active in Arizona youth sports. He served three years as President of one of Arizona’s largest Little Leagues, co-founded a nationally ranked youth baseball team, and coached at the youth level. He also worked with a professional cycling team, providing support both on and off the road.
Brad is also a mountain biking enthusiast and youth trainer. In the gym, he focuses on high-intensity resistance training to help athletes build strength and improve performance.
Our History:
Founded in 1997, our program began by training young athletes—from elementary through high school—helping them develop the strength, speed, and discipline needed to pursue college scholarships and professional opportunities.
As demand grew, the program expanded to train club teams, high school programs, and athletes across multiple sports, supporting both men and women of all ages in reaching peak performance.
Over the years, we broadened our mission to include adult fitness and wellness, helping individuals achieve weight loss, improved health, and personal performance goals. Today, we continue to empower athletes and adults alike to train stronger, move better, and reach their full potential.
Reviews
Testimonials
Son has been with Reggie since 2018. What can I say you want your son to get better , faster to learn discipline to learn respect. Reggie is the man. He has transformed my son from enjoying football as a hobby and an average lineman to now a rb and lb. Reggie breaks it down step by step and it seems repetitive but month after month you will see the improvement the drive the determination. He is honest he will tell you your child is waiting your time or your child is working hard.
My kids have worked with RJ for the past 9 months. My 12 year old son was coming off a major leg injury and is back better than ever thanks to his training! My 16 year old daughter is a basketball player and works with RJ on strength and speed. Amazing progress in the past 6 weeks!! Highly recommend their program!!
Extreme Speed has not only trained and increased speed in my son, but you couldn’t find a better group of men for your child to look up to!!! My son has trained with Reggie for 5 years and during the football season he continues to go train, not just for the workout but for the mental aspect as well. Hands down these are the some of the best trainers available for young athletes today and they train so much more than just football players, they train volleyball, tennis, rugby, golf, track and field, swim, soccer, lacrosse, and so much more.
Phoenix, AZ
Extreme Speed has been one of the best influences in my sons life for the past 6.5 years. He has transformed as an athlete, but also been inspired by these great men. He is physically and mentally ready for college football. I recommend Extreme Speed for any and all athletes from youth to pros and for normal men and women wanting to be their best physically.
