1293 Main St #2

Windsor, CO 80550

(970) 686-2582

24/7 Customer Support

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Personal Trainers

Trainers

Brad Bertoch

Owner / Trainer

Fitness has always been a passion of mine, but I found myself overweight and unhealthy in my early 20’s. I made the decision to better myself and my life by learning as much as I could about nutrition and exercise. I lost over 40lbs and added lean muscle during my fitness journey. I have not stopped since and became certified as a trainer in 2014 and also was certified as a fitness nutrition specialist. I’ve competed in bodybuilding and coached many on the road to their bodybuilding competitions. I’ve owned the gym since 2018 and have loved every minute of it! We are here to help anyone that wants to better themselves by getting stronger, leaner, and more mentally focused! Consistency is the key to success and couldn’t be more important to change your mindset and ultimately your body composition!

Natalie Smith

Owner / Trainer

Helping others succeed is one of my greatest achievements. While working towards reaching my own fitness goals I found that helping others reach theirs was much more fulfilling. I love watching people transform into the best possible version of themselves.

My focus is on exercise, nutrition, lifestyle and most importantly balance between them all!! Wether it be fat loss, muscle building, strength training or just wanting to be a healthier you, myself and the team at ONYX Athletics would love to be part of your journey!!

Rachel Hernandez

Personal Trainer

Starting my personal training journey was an easy decision. After having hired a trainer myself when I was in serious need of motivation and accountability, it was life changing. After the birth of my daughter, I was very overweight, had no energy and my self confidence was completely gone. I knew I needed to change. After training for over 2 years with my former trainer, it made me realize what kind of career path I wanted to take. I now have a passion for fitness and want clients to see how rewarding it is to feel great, have energy and possibly be an inspiration to others.

I became certified in personal training through NASM in May of 2021. I have trained clients of all ages and my experience is gaining momentum. I may be new to the health and fitness industry, but I love what I do and hope my future clients will see the passion I have for this profession with each session they push themselves through.

DeAnna McDaniel

Personal Trainer

I have been teaching at Onyx for a little over a year. I became NASM certified in January of 2022 and TRX level 1 certified in August of 2022. I have a passion for helping people achieve their fitness and wellness goals and love working with all ages of clients. I currently teach the Silver Sneaker circuit and stretching classes along with the Cardio/strength class and have a handful of clients. Currently, I am working on my nutrition certification because I really love to help people understand that food and movement are medicine!!

Gautum Srinivasan

Personal Trainer

I believe movement and strength are foundational keys to building an independent and fulfilling life. Movement starts in the brain and allows us to interact with the surrounding world. Strength training and movement training are the avenues through which we train the nervous system to allow us to live life to the fullest. Training can accomplish everything from rehab to injury prevention to building stronger relationships and even allowing us to make core memories with our loved ones. Fitness is as crucial to a healthy life as nutritional food, staying hydrated and sleep. I believe fitness is for everyone and I’m thrilled to be able to share my passion with those around me!

I’m specialized in biomechanics, neuroscience, rehab and athletic performance.

Years of Experience:
14 Years
Credentials:
BS, Human Biology – University of Southern California
MS, Kinesiology & Neuroscience – The Pennsylvania State University
NASM Certified Personal Trainer

NIck Dunagan

Personal Trainer

After five years serving in the U.S. Army, I found my way to Colorado, where I attended Colorado State University to study Health & Exercise Science. I’m a Certified Personal Trainer and Certified Health & Wellness Coach, with several years of experience working with people through group training and wellness. Fitness became personal for me during my time in the military, when I struggled with my own mental health and discovered that fitness, wellness, and taking control of my health could be a powerful part of the path toward healing.
Now, I’m passionate about helping others experience that same transformation. I believe fitness is about more than how you look—it’s about building strength, confidence, discipline, and the ability to take control of your health and your life. Windsor is where I call home, and I want to make a meaningful impact right here in my community by helping my neighbors become healthier, stronger, and more confident. Whether you’re just getting started or working toward a specific goal, I’m here to meet you where you are and help you build habits that last.

Andrea Deepe

Personal Trainer

I am a Colorado native who loves all things outdoors and enjoys taking advantage of all this great state has to offer. I earned my degree in exercise science from UNC in 2008 and I have been training people from ages 14–80, across all fitness levels, ever since! I especially enjoy working with beginners, helping them learn proper movement patterns from the start. I emphasize the value of building a healthy relationship with exercise so that it becomes part of one’s lifestyle, not a fad or quick fix. I’m here to push you, hold you accountable, and keep your workouts varied so boredom never sets in!