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Meet Our Trainers

Michael O'HaraMichael O’Hara, P.T., OCS, CSCS

Mike is the owner of  Fenton Fitness & Athletic Center.  A graduate of Wayne State University, Mike has over 30 years experience in physical therapy and fitness.  In addition to being a physical therapist, he is also certified through the American Physical Therapy Association as an Orthopedic Specialist.  He is a Certified Strength and Conditioning Specialist through the National Strength and Conditioning Association.


Jeff TirrellJeff Tirrell, B.S., CSCS, CSFS1, Pn1

Program Director

Certified Strength & Conditioning Specialist (NSCA-2008)

Certified Functional Strength Coach (MBSC-2017)

Nutrition Coach (Precision Nutrition-2016)

B.S. in Exercise Science from Western Michigan University

Fenton Fitness: since 2013

Jeff brings a wide range of knowledge to all of his training programs through his experience in workplace conditioning at Toyota, collegiate strength and conditioning, powerlifting, and 19 years of personal experience.  Jeff is a competitive powerlifter and has accumulated 9 top 3 finishes, including a 2nd place finish at the 2013 USAPL TX state championship and 1st place at the 2013 and 2015 USAPL MI state championship. He has qualified and competed at USA Powerlifting Raw Nationals two times (2016, 2017).

Jeff  continually takes courses, attends seminars, and reads research to learn new training techniques to ensure that his programs are grounded in good research and real world experience.


Sharon Karagozian

Sharon Karagozian

Personal Trainer (NASM-1999)

Associate of Science from Ferris State University

Fenton Fitness: since 1999

Sharon is a National Academy of Sports Medicine (NASM) Certified Personal Trainer with 19 years of experience at Fenton Fitness.  Her love of health and fitness prompted her to become a trainer, and she thrives on helping and encouraging individuals to reach their health and fitness goals.  Sharon is personally motivated by strength, wellness, and health and uses this to create her training and nutrition philosophy: Eat well and whole and train for function and health. Sharon stays active and fit through her hobbies of snow skiing, golf, boating, and hiking.


Kristen OwenKristen Owen

Personal Trainer (ACE-2013)

Fenton Fitness: since 2003

Kristen is a Certified Personal Trainer through the American Council on Exercise (A.C.E.).  She cares about people and loves helping them reach their goals. Kristen strongly believes in the vast benefits of exercise in relation to stress reduction, better health, and increased energy, as well as the mental fortitude gained from challenging the body physically. She is naturally active and enjoys hiking, canoeing, horseback riding, and ministry. Kristen’s training philosophy combines food and exercise as medicine: they must be taken in the right dose to get the most benefit.


Chad Flanagan

Personal Trainer (NASM-2016)

Associates in Recreation & Wildlife Management from Hocking College

Fenton Fitness: since 2016

Chad Flanagan is a NASM Certified Personal Trainer. For Chad, fitness has been a lifelong passion, so becoming a personal trainer was a natural progression in his fitness goals. Chad has extensive experience working with various non-profits and leading different team building activities.  Married with two young boys, he leads an active lifestyle in and out of the gym. In addition to lifting weights, Chad likes outdoor activities like fishing, hunting, rock climbing, boating, and camping. Chad came to Fenton Fitness with over 25 years of personal experience and enjoys helping members attain their own fitness goals. Motivated by friendly competition and the hard working members in the gym, his personal goals are to become stronger and more flexible. For optimal results, he pairs his workouts with a simple nutrition philosophy to eat what he wants in a moderate, conscientious way.


Kyle Kowalczyk

Personal Trainer (NSCA-2018)

Certified Functional Strength Coach (MBSC-2018)

B.S. in Public Health Sciences from University of Michigan Flint

Fenton Fitness: since 2013

Kyle is a Certified Personal Trainer through the National Strength and Conditioning Association (NSCA) and has been working for Fenton Fitness and Athletic Center at the front desk for over five years.  He recently obtained a Bachelor’s of Science Degree in Public Health Sciences from the University of Michigan and is planning to continue his schooling to become a physical therapist.  Kyle uses his knowledge on the physiology of the human body and fitness to help every member of Fenton Fitness  achieve their fitness goals.  Personally, Kyle is very passionate about staying healthy and fit.  He exercises in the gym at least six days a week along with staying active outside of the gym playing sports, fishing, and rock climbing.  Kyle’s main philosophy when it comes to working out is that “if you do your best and give 100% effort in every exercise that you perform, the results will take care of themselves.”


Utilizing a trainer on a regular basis will make the time you spend exercising more productive and enjoyable. Your program will produce greater carry over to better function in daily activities, and you will lessen the risk of injury. Most important will be the achievement of fitness goals and the motivation to continue with your program.

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