XMuscle
Fitness Guides & Blog
Fitness Guides & Science-Backed Articles
Evidence-based training, nutrition, and supplementation content — written by coaches, reviewed by the XMuscle science team. No bro-science, no supplement hype. Just what the research actually says.
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Guides dropping soon.
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Training
The Definitive Guide to Progressive Overload
How to add weight, reps, and sets systematically to guarantee continuous muscle growth — the most important principle in resistance training.
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Nutrition
How Much Protein Do You Actually Need?
The research-backed answer to the most asked question in fitness. What 1.6–2.2g/kg means in practice, and how to hit it with real food.
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Supplements
Creatine: Everything You Need to Know
The most studied performance supplement on the market. What it does, how to take it, who it's for, and why loading isn't necessary.
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Recovery
Sleep Is Your Best Performance Drug
The physiology of sleep and muscle repair. How sleep deprivation tanks testosterone, hurts VO2 max, and destroys training adaptation.
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Fat Loss
The Truth About Fat Loss: Calories, Cardio & Muscle Preservation
Why most fat-loss plans fail, how to preserve muscle in a calorie deficit, and the exact cardio protocol that works without sabotaging strength.
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Training
PPL vs Upper/Lower: Which Split is Right for You?
A no-nonsense comparison of the two most popular intermediate splits — with training-frequency research to back the recommendation.
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Nutrition
The Vegan Lifter's Complete Protein Guide
Complete amino acid profiles, bioavailability corrections, and a practical daily meal template for plant-based athletes hitting 180g+ protein.
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Supplements
Caffeine Timing: Pre-Workout Done Right
Adenosine antagonism, half-life windows, tolerance cycling, and why your 3pm coffee is wrecking your sleep more than your morning espresso.
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Training
How to Structure Your First Year of Lifting
The beginner's roadmap: choosing a programme, learning the big lifts, tracking progress, and avoiding the mistakes that stall 90% of new lifters.
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