
Garrison Niemiec
MS in Exercise Physiology · BS in Exercise Physiology · NSCA-CSCS · NSCA-CPT · USAW SPC-1
Garrison, from Arvada, CO, opened Kaizen in 2019 after completing graduate studies in exercise physiology, studying how the body responds and adapts to physical training at the cellular level. Currently, he trains in Brazilian Jiu-Jitsu, Muay Thai, and strength training.
His coaching record includes D1 volleyball and football athletes, NBA players, USA Olympic softball athletes, and semi-professional hockey players. He has presented at three national NSCA clinics and currently serves as the Oklahoma State Director for Fitness and Weightlifting Events at the Oklahoma Senior Games.
During COVID, Garrison developed the at-home training framework adopted by the Oklahoma National Guard, a project that required building effective, measurable programming without facility access.

Romero Gatewood
USAW L-1, NASM-CPF
Weightlifting
With 10 years of experience and a genuine love for the craft, I’m here to help you bridge the gap between where you are and where you want to be. I specialize in the technical precision of Olympic lifting, strength development, and aerobic capacity, utilizing my background with USAWL and NASM certifications to ensure your training is as effective as it is safe.
I’ve spent years attending specialized seminars to gather the best tools and knowledge to apply to your unique goals. I’m a firm believer in the "Kaizen" philosophy—the idea that small, daily improvements lead to massive results over time. My true focus is on functional movement that helps you live a pain-free life of longevity, and I’m committed to making sure you feel supported every time you walk through our doors. Let’s work together to make sure you're moving well and feeling even better!

Hensley Miller
BS, NASM-CPT
Total Wellness: Strength, Mobility & Nutrition
Hensley was born and raised in Enid, OK and went on to earn her bachelor's degree in Health and Exercise Science from the University of Oklahoma. She combines her education with a practical coaching approach centered around building sustainable lifestyle habits through individualized training, realistic nutrition strategies, and consistent progress over time. She believes fitness should be simple, though not always easy, and that lasting results come from consistency with the basics. Hensley brings Kaizen members a straightforward, supportive approach that helps them build strength, improve overall health, and create results they can maintain.

Will Sheppard
NSCA-CPT
Athletic Performance, Strength, and Mobility
Will, from Ada, OK, graduated from the University of Oklahoma with a Bachelor’s in Health and Exercise Science. He is a former competitive gymnast with 12 years of experience, including two years competing at the University of Oklahoma. He’s been a trainer at Kaizen for over 2 years. He is passionate about building a strong and athletic foundation for the youth, pushing clients to reach their goals, and holding everyone accountable to be the best they can be.

Buffy
Buffy has two years of experience and has been with the team the longest, second only to our owner. Her favorite gym exercises are battle ropes and sleds. Buffy is passionate about accountability and regular check-ins to ensure you meet your goals. As our toughest coach, she provides tough love when needed and is your biggest cheerleader when you're excelling in the gym.

Gojo
Gojo is our most involved Kaizen Coach. Certified as an emotional support dog, he takes his role seriously. Gojo specializes in spotting and providing rest break hype-ups. He is passionate about maintaining an active lifestyle and enjoys behind-the-ear scratches.

Maple
Maple is our newest coach. She is currently in the middle of her own weight loss journey so you will have a battle buddy through it all. Maple will mow down every obstacle in your way of success, even if that obstacle is your own self doubt. Maple is most passionate about our members and treats all of them as family.
Assistant Coaches
The coaching staff at Kaizen is credentialed, experienced, and present.
Every coach on the Kaizen floor holds legitimate certifications in their field. You won't find general fitness instructors here. You'll find coaches who know why your program is built the way it is and can adjust it when you need them to.


