The #1 Thing Most Personal Trainers Don’t Know Enough About (But Should)
If you’re a personal trainer, you already know how to write a great exercise program.
You know how to get someone stronger.
You know how to help them lose weight.
You know how to push intensity and drive results in the gym.
That’s not the problem. As both a Lifestyle Medicine MD and Certified Personal Trainer, the problem I see over and over again is clients’ results are not limited by your programming—they’re limited by everything they’re doing outside of it.
The number one thing most personal trainers don’t know enough about (that they absolutely should) is lifestyle optimization.
Training is just one input. The outcomes your clients want—fat loss, muscle gain, energy, longevity—are driven just as much (if not more) by what happens outside the gym. When you begin to more fully understand how to optimize sleep, circadian biology, recovery, nutrition, and behavior change, you will become indispensable to your clients. And until you understand these concepts, you’re always going to feel like some clients just “don’t respond” the way they should.
What is Lifestyle Optimization?
Lifestyle Optimization is all about aligning how your client lives with how their biology works. These are evidence-based, clinically-proven strategies and techniques that will improve not only your clients’ results in the gym, but will make them healthier, feel better, and live longer.
Healthy living is not about hacks, or trends, or biohacking. People are entirely tricked into thinking that’s what they need to get that extra edge. The truth is much simpler. You need to master the fundamentals of healthy living. If you want to improve your health and your results, you must build healthier habits, routines and spaces in your day to day life. It’s proven to work over and over again. And that’s precisely my area of expertise
For the best results, you need to apply evidence-based fundamentals consistently.
WHAT AREAS SHOULD YOU FOCUS ON?
1. Circadian Rhythm
Most trainers don’t think enough about circadian rhythm—but it’s quietly driving a lot of what you’re seeing. Your client’s body is running on a 24-hour rhythm that regulates hormones, alertness, metabolism, and recovery. When that rhythm is inconsistent, everything downstream becomes harder and sure enough it will negatively affect the results that you’re working so hard to achieve.
This is the client who:
Is dependent on naps and caffeine to keep them going
Has inconsistent energy levels throughout their days
Stays indoors all day with no anchoring light exposure
First understand that this is not motivation problem—it’s often a timing or lifestyle problem. In practice, it’s not complicated but life is different for everyone—and that’s why these principles are crucial to understand so you can help all of your clients.
What matters is helping your client anchor their day: getting light exposure, keeping sleep and wake times consistent to stabilize energy and hormone patterns, and a number of other influential factors. When you help a client fix this, you’ll often see improvements in energy, sleep, and even adherence within a week.
2. Sleep Health & Recovery
If there’s one area that gives the biggest return with the least complexity, it’s sleep. Sleep is the most effective recovery tool humans have and it provides the biggest return on improving performance. All of the elite athletes have trainers and coaches who understand this—so much so that many of them track their sleep regularly.
Sleep is not just “rest”—it’s when the body actually carries out the adaptations you’re trying to create with training. It’s when your body is building itself, repairing itself, and recovering.
If your client is consistently under-sleeping, you’ll see it show up as:
Poor recovery between sessions
Increased hunger and cravings
Reduced performance and output
Slower fat loss and muscle gain
(Note: Circadian Rhythm and Sleep Health is a GREAT topic and a course that I teach alongside Dr. Carmela Kiraly—a board-certified sleep medicine physician. Links at bottom of the page).
3. Nutrition Strategies
Nutrition can be a tricky topic and while personal trainers do NOT prescribe nutrition plans, they absolutely need to be educated on how nutrition impacts performance and overall health. We are what we eat has always been true. What you really can help your clients here with are nutrition fundamentals and impressing on them how to utilize nutrition to reach their goals.
And believe it or not, most people simply need help with building a better system for them that makes it easy to execute consistently. That’s where you come in. Instead of overwhelming them with detail, your role is to create structure:
Macronutrients and micronutrients that support healthy living
Food choices are simple, repeatable, and realistic for their lifestyle
Understanding the importance of hydration to health and performance
The mistake is assuming more complexity leads to better outcomes. In reality, the clients who succeed are the ones who can repeat a simple strategy over and over again without friction. If they can’t sustain it, it’s not optimized—it’s just temporary.
You will excel when you can provide nutrition education to your clients on how to create healthier living spaces, habits, and routines.
4. Stress Management
You can program perfectly—but if a client’s stress is high or unmanaged, it will negatively effect their results. Make no mistake—personal trainers are not mental health experts but you do play a crucial role in recognizing clients’ behaviors when something might be off.
It’s also quite common. Many folks are turning over a new leaf or have a recent change in their life that have led them to being more serious about their health and exercise. Having another sense about this (and some background education) can make a big difference.
Poor stress management shows up in ways that are easy to miss if you’re not looking for it:
Poor sleep despite being “tired”
Increased cravings or emotional eating
Low motivation or inconsistent adherence
You don’t need to turn this into a full mental health intervention, but you do need to acknowledge that stress is part of the equation and coach accordingly.
That might look like:
Encouraging daily movement outside of structured workouts
Introducing simple breathwork or downregulation practices
Adjusting expectations during high-stress periods instead of pushing harder
And last but not least…
5. Behavior Change—the MOST underrated skillset that many don’t have
I want you to listen to me loud and clear on this…. Behavior Change is the skillset that separates trainers who get short-term results from those who create long-term transformation. At the end of the day, your client’s success is not based on what they know—it’s based on what they do repeatedly when you are long gone and out of their lives.
The reality is the vast majority of people (trainers and coaches included) struggle with using effective strategies to create long-lasting change. Motivation can only get you so far, but like a tank of gas—motivation will eventually run out. When it does, you will depend on the habits, routines, and spaces that you’ve created for yourself.
How to do this? You want to make these shifts:
From giving more information → to building better systems
From chasing motivation → to creating routines
From all-or-nothing thinking → to small, repeatable actions
If a client can integrate a habit into their daily life, it compounds. And if they can’t? It disappears.
If you want to actually learn how to do this
The Lifestyle Optimization topics above are exactly what I teach inside my courses—how to take these concepts and apply them in a way that’s practical, structured, and grounded in real physiology.
NASM or AFAA Certified? https://www.atlasmd360.com/nasm-afaa-courses
ACE, ACSM, or ISSA Certified? https://www.atlasmd360.com/ace-acsm-issa-courses
If you take one thing from this: Your client doesn’t need a more “optimal” program. They need a more consistent, structured lifestyle.
And if you can help them build that, everything else starts to work the way it’s supposed to. Thank you for reading and please reach out if I can be of any assistance with your educational needs.
—
Dr. Christo Frangpoulos
AtlasMD360 Courses by Focus Area:
Behavior Change: Help clients build sustainable habits with The Power of Change. I’m convinced this is a must-take course for everyone.
Exercise as Medicine: Learn how movement protects against disease in The Exercise Effect. This bridges the gap between medicine and exercise.
Sleep Optimization: Teach clients better rest strategies with Restorative Sleep. This teaches all about the ultimate performance enhancer!
Nutrition: Get evidence-based foundations with Nutrition for Health and Performance. A comprehensive course with many coaching tools.
Mental Wellness: Explore stress, resilience, and emotional health in this course. Mental Health is intimately intertwined with Physical Health.
👉 Explore the full course lineup here:
ACE-Approved Courses (note: use this if you’re ACSM or ISSA)
All of our courses are:
Clear and modular
Supported by decades of clinical research
Developed by a team of experts in Lifestyle Medicine, Integrative Medicine, Health & Wellness Coaching, and Fitness Professionals
Backed 100% by a Satisfaction, Money-Back Guarantee
AtlasMD360 courses are crafted specifically for professionals who want trustworthy content, not guesswork. The full comprehensive course gives you a true, in-depth look at lifestyle optimization as each Building Block builds upon each other. Collectively, the course teaches complete wellness that can help your clients achieve long-lasting results.
