The First Principles of Health and Fitness
It all begins with an idea.
From Director of Health Alex Maples
You’re busy. You’ve spent a lifetime dialing in where and how to spend your time, effort, and resources to get the best results: in your business, with your investments, with your family, and maybe in your fitness journey. There’s a lot of noise in the fitness space, and there’s nothing more frustrating than wasting your time and energy on something that doesn’t get you the results you want.
Welcome to First Principles, a series of posts and resources to help you focus on what truly moves the needle so the energy you spend improving your health is as efficient and effective as possible.
We’ll dive into four main pillars – the foundations that provide the greatest return on our investment when it comes to building lasting health. Here’s the quick overview:
Body Composition: What You’re Made Of Matters
You probably know that body composition matters. (Look better? Check. Be healthier? Double check.)
But your ratio of muscle to fat isn’t just about aesthetics or a standalone marker of “health” – it’s metabolic currency. More muscle improves insulin sensitivity, bone density, and resting metabolic rate. Too much fat, especially around your organs (visceral fat), drives inflammation and increases the risk for chronic disease. Improving lean mass while reducing fat is strongly associated with lower all-cause mortality.
Think of muscle as a long-term asset – it keeps you strong, mobile, and resilient as you age. But, we all lose muscle as we age. Building more now helps retain more later, helping you stay upright and independent.
Fat, on the other hand, is the cost of doing business. Sometimes it accumulates as a byproduct of growth. That’s okay – it's part of the process. But eventually, the books need to be balanced. That’s where fat loss phases come in. They’re financial audits – strategic, intentional efforts to trim the excess and keep the health account in the black.
Cardiorespiratory Fitness: The Engine Under the Hood
Often relegated to the realm of endurance sports nuts, cardiorespiratory fitness (CRF) is in fact one of the strongest predictors of lifespan. VO₂ max, a key measure of CRF, reflects how well your body delivers and uses oxygen – a capability every cell in your body depends on.
Good CRF helps you think clearly, recover faster, and handle more physical and mental stress. It lowers the risk of heart disease, stroke, and even some cancers. (And, yes, it lets you run that ultra if you want to.)
The best part? You don’t need to run marathons. Consistent zone 2 cardio (think brisk walking, cycling, rowing at a conversational pace), along with occasional higher-intensity sessions, can make a profound difference.
Sleep and Recovery: Your Built-in Repair System
When you’re trying to get healthier, the first instinct (like many people’s) might be to add more: more workouts, more supplements, more productivity hacks. But sometimes the most powerful lever is knowing when to rest.
Without quality sleep and recovery, you don’t adapt – you just accumulate stress. Recovery is when your body rebuilds, your hormones rebalance, and your mind processes the world around you.
Lack of sleep impairs glucose metabolism, weakens the immune system, disrupts mood, and fogs cognitive function. Deep sleep, in particular, is essential for physical restoration.
When you train, you write the check. Recovery is when you cash it.
Stress Management and Purpose: The Psychological Core
You can’t out-lift chronic stress or out-supplement a lack of meaning. (Read that again.)
Stress isn’t inherently bad – if you have goals or care about anything (i.e., you’re human), stress comes with the territory. In fact, too little stress can be just as dangerous, often signaling a lack of purpose or engagement.The real key is learning to manage and channel it.
Chronic stress disrupts your hormones, appetite, sleep, and focus. But when stress is anchored to purpose, it becomes fuel instead of friction.A clear why is a GPS for your nervous system. It helps you reframe discomfort as growth, and it keeps you aligned when life gets messy.
You build resilience just like you build strength: through consistent training. Breathwork, boundaries, meaningful relationships, movement, time in nature – these are essential tools, not luxuries.s.
It’s a System, Not a Checklist
These four pillars don’t exist in isolation – they support and amplify one another. Better sleep enhances body composition. Cardio improves stress tolerance. Purpose sustains consistency.
Health isn’t about chasing perfection – it’s about mastering the fundamentals and building a system that works for your real life.
This series is designed to equip you with practical tools and mental models to strengthen the core pillars of health. You’ll learn how to filter out the noise, focus on what actually matters, and tailor a system that fits your goals and lifestyle. Whether you want a quick overview or a deep dive, you’ll find both the why and the how, along with a clear roadmap to support not just your health, but your life as a whole.
What You’re Made of Matters
It all begins with an idea.
From Director of Health Alex Maples
Your ratio of muscle to fat isn’t just about looks. Body composition shapes how your body functions and how long (and well) you live. In fact, outside of not smoking, few factors impact your long-term health outcomes more.
There are two main levers to improve body composition: Building muscle and losing fat. Simple, not easy. We’ll hit the “how” shortly; first, here’s why these levers matter.
Why Muscle Matters
Muscle isn’t just for athletes or bodybuilders. It’s a critical asset that protects your health and independence as you age. Call it a “longevity organ.”
Here’s what the research has to say about it:
Lower All-Cause Mortality
Adults over 55 with higher muscle mass had a 20–30% lower risk of death over 10 years. In plain English: more muscle, better odds over time.Better Metabolic Health
Muscle is the primary storage site for glucose. Each 10% increase in skeletal muscle index reduced insulin resistance by 11% and cut the risk of type 2 diabetes by 12%.Cardiovascular Protection
Muscle supports healthy cholesterol, blood pressure, and vascular function. Research has shown a 25% lower risk of cardiovascular events in those with higher muscle mass.Bone Density & Fall Prevention
Muscle strengthens bone and stabilizes joints. Resistance training reduces fracture and fall risk by over 30%, especially in older adults.
Mental & Cognitive Health
More muscle is linked to lower depression and cognitive decline. Multiple studies show reduced risk of depression (20%) and cognitive impairment (30%) in those with greater muscle mass.
Use It or Lose It
Without intervention (i.e., training), most people begin losing muscle mass by midlife (≈30s–40s) at roughly 0.4–0.8% per year, with faster losses in later decades (≈0.6–1%/yr by the 70s). Strength declines more rapidly (≈2.5–4%/yr in the 70s). The result: accelerated weakness and frailty, raising risks to independence.
But it’s not inevitable. Resistance training can not only prevent muscle loss, it can reverse it – even into your 50s and beyond. Think of muscle as your health retirement account. The more you invest early, the more protected and resilient you’ll be later in life. And just like financial savings, it’s never too late to start making smart deposits.
Why Excess Body Fat Harms Health
Carrying excess body fat – especially visceral fat (the kind that surrounds organs in the abdomen) – raises your risk for nearly every major chronic condition:
Increased Mortality
A meta-analysis of 10 million+ people found each 5-point increase in BMI above 25 raised mortality by 31%.High Blood Pressure
Excess adiposity is estimated to account for ~65%-75% of primary hypertension; in Framingham, 78% of essential hypertension in men and 65% in women was attributable to obesity.Heart Disease
A meta-analysis found that higher BMI and larger waist circumference are linked with greater risk of heart failure and other cardiovascular events.Metabolic Dysfunction
Excess fat impairs insulin sensitivity and spikes your risk of diabetes and metabolic syndrome. A 5 kg/m² BMI increase often more than doubles your diabetes risk.Cancer Risk
Excess body fat is linked to 13 types of cancer in epidemiologic research.Mental Health & Cognition
Obesity increases the risk of depression (32%) and increases risk of cognitive decline with aging.Joint and Respiratory Issues
Excess weight stresses joints and narrows airways, raising the risk for arthritis, sleep apnea, and asthma.
How to Improve Body Composition
Reduce Body Fat
Create a modest calorie deficit with food + movement (think sustainable, not crash).
Focus on nutrient-dense, protein-forward meals to stay full and preserve muscle.
Track progress with trend-friendly tools (BIA scales or DEXA scans) – not just weight.
Build Muscle
Stimulus: Resistance training (3–5x per week) is key to signaling your body to grow muscle.
Substrate: Aim for 0.6–1g of protein per pound of goal body weight daily.
Rest: Recovery allows muscles to rebuild stronger. Prioritize sleep and manage stress so you can come back tomorrow.
Bonus: If you're new to lifting, you may experience “body recomposition” – losing fat and gaining muscle simultaneously.
Where Should You Be?
“Optimal” varies, but these are general body fat ranges associated with good health:
Going too low may suppress hormones and impair function – so leanness for the sake of leanness isn’t the goal. Sustainable health is.
How to Measure Your Body Fat
Knowing where you stand is essential for improving body composition. While there are many methods out there, the two most accessible and practical options are DEXA scans and BIA (bioelectrical impedance analysis) scales. Each has its pros and cons – understanding both will help you use them wisely.
DEXA Scan: The Gold Standard
What it is:
A medical imaging scan that measures bone density, lean tissue, and fat mass with a high level of precision.
Pros:
High accuracy: Margin of error is typically around 1–3%.
Regional data: Shows fat distribution (e.g., visceral vs. subcutaneous).
Bone density insights: Valuable information for aging and injury prevention.
Cons:
Cost: Typically $50–$150 per scan.
Access: Must be done in a clinical or wellness setting.
Radiation: Very low dose, safe for periodic use but not for frequent tracking.
Best for: Establishing a reliable baseline 1-2 times per year.
BIA Scales: Convenient, but Often Underestimate
A small electrical current estimates your body fat percentage based on conductivity (water-rich muscle tissue conducts electricity better than fat).
Pros:
At-home convenience: Easy to use consistently.
Affordable: Many good options under $100.
Good for trend tracking over time with consistent conditions.
Cons:
Less accurate: Error margins range from 3–8% or more.
Underestimates BF%, especially in lean or muscular individuals.
Affected by hydration, food intake, and time of day.
Limited detection: Most home devices use only hands or feet, which can miss central fat stores.
Example: If your BIA scale says 12%, you might actually be closer to 15-17% depending on your muscle mass and hydration.
How to Use BIA Effectively
Despite its flaws, BIA can still be a valuable tool if you use it the right way:
Measure under consistent conditions: same time of day (ideally in the morning, fasted, and post-bathroom).
Track the weekly average, not individual daily readings.
Look for trends over time, not absolute values.
Pair with occasional DEXA scans to recalibrate your sense of what your scale is really showing you.
Closing Thoughts
Muscle supports everything from strength and mobility to mood and metabolism. Excess body fat compromises them all. By improving your body composition, you're not just changing how you look (although when you feel good about how you look, you’ll perform better and have more confidence). You're investing in the duration and quality of your life for the long term.
The Engine Under the Hood
It all begins with an idea.
From Director of Health Alex Maples
When most people think of cardio, they think of calorie burn. And while it does burn calories, that’s just one tiny part of the picture. In fact, if your primary goal is weight or fat loss, cardio may not even be the most effective tool (see Body Composition: What You’re Made of Matters).
Here’s the real headline: Cardiorespiratory fitness (CRF) offers a huge return on investment that has nothing to do with calorie burn. From heart health to brain function to how long (and how well) you live, its impact is both broad and profound. It’s not just about burning energy. It’s about building capacity.
CRF and Your Baseline Operating System
Cardiorespiratory Fitness (CRF) is your body's ability to deliver oxygen to muscles during sustained physical activity. It’s a measure of how well your heart, lungs, blood vessels, and muscles all work together as a team. Improve CRF, and you upgrade your default state – not just your workouts. Here’s what that means:
Lower Resting Heart Rate & Blood Pressure
With higher CRF, your heart becomes more efficient. It pumps more blood per beat, so it doesn't need to work as hard at rest. In other words, a stronger engine idles lower:
Resting heart rate often lands around 50-60 bpm in fit individuals.
Blood pressure trends lower.
Blood flow to the brain and organs improves.
This improved efficiency makes everyday tasks (climbing stairs, walking, standing for long periods) feel easier. You’re simply operating with a better engine.
More Resilient Nervous System
Higher CRF enhances autonomic balance, boosting parasympathetic tone (your “rest and recover” system). That means:
You handle stress better.
You recover faster from both workouts and life events.
Heart rate variability (HRV) tends to improve (a marker of adaptability and nervous system health).
Protective Effects of High CRF
Lifespan extension: Significantly lower risk of all-cause mortality, with no upper limit of benefit (i.e., benefits stack as fitness improves).
Reduced cardiovascular risk: Lower risk of heart disease, stroke, hypertension.
Improved metabolic health: CRF improves insulin sensitivity and blood sugar regulation.
Brain benefits: Better mood and memory, plus protection against cognitive decline.
Consequences of Low CRF
Low CRF doesn’t just make life harder – it makes it shorter.
Increased mortality risk: Worse overall health outcomes – on par with major risk factors like smoking, diabetes, or hypertension.
Fatigue and poor recovery: Less energy for daily life and workouts, and decreased stress resilience.
Higher disease burden: Increased risk of cardiovascular, metabolic, and neurodegenerative diseases.
Faster aging curve: Mitochondrial decline, reduced capacity to handle physical and psychological stress.
How to Improve CRF
First and foremost, get moving! Nuance helps, but movement is the foundation of good CRF. And, it doesn’t matter how you do it – you can walk, hike, bike, run, row, paddle, swim, dance, jump rope, or play sports. Explore until you find a few that you actually enjoy. Joy is compliance, and compliance compounds – like steady deposits in a well-run account.
The Takeaway
Cardio is more than a calorie incinerator – it’s a capacity builder. Better CRF means that everything else that matters (thinking, sleeping, training, even stress management) gets easier. If strength training writes the check, aerobic fitness is the cash flow that keeps your whole system liquid.