Hi there! I'd like to thank you for taking the time to explore this page. I'm Kelsey Lee Miller, an evidence-based, relational fitness expert based in Orange County, California. I'm here to help you design a lifestyle that helps you get fit, and more importantly, stay fit, for life. There's a lot of misinformation floating around on the internet, and my goal is to help you find your path involving the right fuel and improve how you move, so you can flourish! If you want someone to listen to your goals, understand what motivates you, and implement actual science-based training protocols in a sustainable program that will get you fit, this is the spot for you! Life is too short to spend all your time consumed with what you do in the gym, so let's come up with a plan and make fitness work for you.  


-Earned MS in Kinesiology (concentration: Human Performance and Sports Psychology) from Cal State Fullerton in 2017.

- Earned BS in Kinesiology (concentration: Pre-Physical Therapy) from Biola University in 2011. 

-Certified Strength and Conditioning Specialist (CSCS) & Certified Personal Trainer (CPT) through the National Strength and Conditioning Association (NSCA)

- I've been helping tens of hundreds of people just like you transform their lives and become physically and mentally stronger. 


I am a former high school volleyball player and track athlete, who used to struggle with being 6 feet tall and lanky. Through out college, I would run to relieve stress, and over time it became an unhealthy addiction. If I ate a cookie, I felt I had to go for a run to make up for it, and it over time my relationship with food and consequently, exercise, continued to spiral downward. I was not flourishing. It was a miserable way to live. I was not focusing on what my body could do, but using exercises purely to either relieve stress or punish myself for what I ate (while the former isn't necessarily negative, the latter certainly is). It wasn't until my last year of college and well into my first internship after school that my relationship with exercise changed for the better.

Throughout the years up to this point I was uncomfortable lifting weights because I didn't know what I was doing when I was on my own, and never saw many females in the free weight section in the gym. Combine that with wanting to feel confident in whatever I did, and I was inclined to go try something I had no clue how to do. 

When I first became introduced to the weight room, I felt like a curious, little fish in an ocean full of big fish. I was interning at a performance clinic, being mentored and eventually working alongside coaches who were training professional baseball and football players, in addition to some high level CEO's. While the environment was predominantly male dominated and definitely intimidating, I had decided I was going to give this a fair shot.

The game changed for me when I had a coach I was mentoring under assess my movement, design me a program, and walk me through form for each and every lift I was prescribed. I finally started to feel a little bit of confidence performing the exercises on my own. My mindset shifted from feeling the need to be 'small' to wanting to be 'strong' and seeing what my body was capable of. I felt stronger, more feminine and had muscular curves that I'd never had before. It was so empowering, and I was in! 

Was I good at everything the first time? Absolutely not. Did I experience failure? Yes, many times, but I learned this is the best way to grow and improve. Failure can be a great teacher, if you let it. I had to show up every day, gulp my fears down and walk in with a smile like I owned the place. I chose to be brave. I gained confidence. I gained strength. I began to move more efficiently, feel better, and think more clearly.


I want you to experience all of the things I did when I made weight training + conditioning a lifestyle habit. I don't want you to see exercise as punishment. It's literally changed my life, and I am passionate about helping others experience these same victories, and learning how to change their mindset in order to do so. It takes hard work, but it can also be really fun, and as a result, you flourish!

If you feel intimidated walking into the weights section in your gym, or just directionless, you are not alone, I hear you, see you, and understand your concerns! 

Together, we can take the first step towards your path to improve the fuel you consume, and the movement you perform, so you can flourish in life.

It's time to start saying yes to yourself to see what you can do!



The Word on the Street

I’ve been going to Kelsey Miller for fitness and strength training for approximately a year.  Over that time, Kelsey has gradually and carefully helped me to become stronger, with more energy and stamina.  As a woman that is 72 years old, Kelsey ensures that I do the exercises carefully so as not to injure myself.  But, she still challenges me sufficiently to allow me to have made remarkable progress.  I surprise myself at what I’ve accomplished and what I can do.  Kelsey is positive and up-beat in her approach and professional in everything she does.

Georgeann L.

I trained with Kelsey at the Fitness Edge in St. Louis. She was knowledgeable, professional and listened to my training needs, likes and dislikes . Kelsey is a very personable individual who I enjoyed working with each time. I recommend her services without hesitation.

Kyle M.

Kelsey has been my personal trainer for nearly 1 year. She has always displayed an expert knowledge of the field and has inspired/assisted me in attaining my personal fitness goals. It saddens me that she is leaving the area and will no longer be available to be a part of my fitness life. That being said, I am sure she will succeed in any position she pursues in the future. I would highly recommend Kelsey both professionally as a trainer and as a personal of high moral character.

Zachary V.

Working with Kelsey changed my life and my dress size.  I love running but I hate gyms.  When I stopped running I tried the gym.  But I didn’t what I was doing and was uncomfortable being around everyone who did, or trainers who didn’t listen. (I would say that I wanted to work on my upper body and they would give me leg exercises!
I watched CrossFit on YouTube but that was over-the-top for what I needed. I went to a fitness boot camp with a friend, but I couldn’t keep up.  Then I heard about Kelsey Lee Fitness.  I thought about gawking strangers judging my form, tailored to my current condition and my personal goals. It sounded perfect, and it was!  Pleasant music, someone making sure my form was correct, adding just enough weight to grow stronger without doing damage.  I did more than I ever imagined with her careful training and always felt safe.  Her tips on eating and drinking were a bonus.  I’m down a dress size, more toned, and my posture has improved.  I feel like she rolled the clock back  on my age. You owe it to yourself to check her program out.

Sally M.


"Sometimes the bravest, scariest, and most valuable thing you can do is just show up. Let go of fear and see what you're capable of."

Kelsey Lee



  • Kelsey Lee Miller

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