4P Fitness Insights
Explore practical, science-backed insights on strength, mobility, nutrition, recovery, longevity, and today’s biggest fitness trends. Use the category filters or search bar below to quickly find the guidance, answers, and topics that matter most to you.
Subscribe to the Insights 🎧 Podcast
Prefer to listen? Subscribe on Substack for practical conversations about Strength, Mobility, Nutrition, Recovery, and building a body that stays capable for life. New episodes will be delivered directly to your inbox.
Creatine After 45: What the New Research Actually Says
Creatine isn’t just for bodybuilders. New 2026 research in adults ages 45 to 65 raises new questions about strength, lean mass, muscular endurance, body composition, and cognition, including possible benefits without structured exercise. Coach Stephan breaks down what the research actually shows, what remains uncertain, and how creatine fits into a smart strength and longevity plan.
Introducing the Four Pillar Fitness Insights Podcast
The Four Pillar Fitness Insights Podcast is now live on Substack. Coach Stephan Earl introduces the new video podcast, explains why he created the Four Pillar Fitness system, and shares how Strength, Mobility, Nutrition, and Recovery can help adults cut through fitness noise and build a clearer path to long-term health and capability.
Why You’re Not Seeing Results, Part 1: Your Workouts Aren’t Progressing
You’re showing up at the gym, but your results have stalled. Learn how progressive overload, training intensity, nutrition, recovery, and honest progress tracking can help reveal what’s missing from your fitness approach.
You’re Planning for a Longer Career. Are You Training for One?
Career success doesn’t guarantee the strength, mobility, or energy needed to enjoy it. Learn how busy professionals can use strength training, mobility, nutrition, and recovery to build physical capacity for longer careers, active families, and greater independence.
Strength Training Fundamentals: The Blueprint for Building Muscle and Getting Stronger
Build a smarter strength training plan with this practical guide to progressive overload, sets, reps, RIR, rest periods, drop sets, supersets, failure training, workout tracking, and recovery. Learn how to train independently, choose when to increase weight, and use advanced techniques without overcomplicating your workouts.
Why GymTok Can Mess With Your Fitness Goals
GymTok can motivate you, but it can also distort your goals. This Coach Insight breaks down how viral fitness content, extreme physiques, supplement hype, and unrealistic standards can affect body image, and how to stay focused on real progress.
GLP-1 Weight Loss Doesn’t Replace Strength Training
GLP-1 medications can support weight loss, but new research suggests people may move less after starting them. Learn why strength training, daily steps, protein, mobility, and recovery still matter for preserving muscle, supporting metabolism, and building a healthier body during weight loss.
Intermittent Fasting: What It Can Do, What It Can’t Do, and How to Use It Wisely
Intermittent fasting can be a useful nutrition tool, but it is not magic. Learn what fasting may help with, what it cannot do, who should be cautious, and how to use it wisely while still prioritizing protein, strength training, recovery, and long-term consistency.
Why You Feel Strong One Day and Weak the Next
Why does the same weight feel easy one day and heavy the next? Learn how sleep, stress, food, hydration, accumulated fatigue, menstrual symptoms, and workout setup can affect daily strength, plus how to adjust a difficult session without mistaking normal performance fluctuations for lost progress.
Gym Squatters: When Phone Scrolling Starts Stealing the Workout
Phones can be useful training tools, but scrolling on machines can hurt workout focus and frustrate other gym members. Learn how to use your phone with purpose, respect shared equipment, and avoid becoming a gym squatter.
Gym Anxiety Is Real: How to Start Training Without Feeling Like Everyone Is Watching
Gym anxiety is real, but it does not have to stop you from training. Learn why gyms can feel intimidating, how beginners can build confidence, and how a simple strength, mobility, nutrition, and recovery plan can help you feel more comfortable and consistent in the gym.
Weighted Vest Walking Is Back: Benefits, Risks, and 5 Vests Worth Considering
Weighted vest walking is trending again, but is it worth it? Learn the benefits, risks, how to start safely, and 5 weighted vests worth considering for walking, rucking, bodyweight training, and conditioning.

