Fitness Science Guides
37 evidence-based guides covering training, nutrition, myths, and AI coaching
Showing 37 of 37 guides
Progressive Overload: The Science of Muscle Growth
The 3 hypertrophy mechanisms and 6 progression methods backed by 12 studies.
How Many Sets Per Muscle Per Week?
Meta-analysis data: 12-20 sets per muscle is optimal. Full per-muscle breakdown.
Best Exercises Per Muscle (EMG Data)
EMG-ranked top exercises for every muscle group from 50+ studies.
Rest Between Sets for Muscle Growth
3-min rest produces 2× more muscle than 1-min. Goal-specific protocols.
Deload Week: When, Why, and How
Tapering improves performance 2-3%. No muscle loss in 2-3 week deloads.
Sleep and Muscle Growth
70% of GH secreted during slow-wave sleep. 5h sleep cuts testosterone 10-15%.
How Long Does It Take to Build Muscle?
Beginners gain 0.5-1 kg/month in year 1. Timeline explained with 10 studies.
Muscle Memory: How Fast Can You Regain Lost Muscle?
Myonuclei persist 3+ months. Muscle regrowth is 2× faster after a break.
Body Recomposition: Build Muscle & Lose Fat
Simultaneous fat loss and muscle gain. 9+ studies. Optimal protein 2.3-3.1 g/kg.
How Much Protein Do You Actually Need?
Science-backed recommendations. Optimal range: 1.6-2.2 g/kg/day for muscle growth.
Complex Carbs: Best Sources for Athletes
Science-backed rankings of the best complex carbs for bodybuilding performance.
Intermittent Fasting for Muscle Growth
Latest science on IF for muscle growth and fat loss. Evidence-based protocols.
Creatine: Complete Science Guide
Loading, timing, dosage from 35+ studies including the ISSN Position Stand.
Caffeine and Athletic Performance
3-6 mg/kg boosts endurance 2-4%, strength 2-7%. 14 studies + ISSN Position Stand.
Omega-3 and Muscle Recovery
EPA and DHA reduce DOMS, accelerate recovery. Optimal dose: 2-4 g/day. 15 studies.
TDEE: Calculate Your Exact Daily Calorie Needs
TDEE = BMR × activity. Mifflin-St Jeor equation, NEAT, and metabolic adaptation.
Caloric Surplus for Muscle Growth: How Much?
Optimal surplus: 200-500 kcal/day. Slow surpluses preserve lean mass ratio.
Calorie Deficit for Fat Loss: The Exact Numbers
Optimal deficit: 300-500 kcal/day. Hall (2011) debunks the 3,500 kcal rule.
Protein Timing: Does the Anabolic Window Exist?
The real window is 4-6 hrs. Timing effects vanish when total protein is equated.
How Much Water Do Athletes Actually Need?
2% dehydration cuts aerobic performance 10-20%. The "8 glasses" rule has no basis.
Is Breakfast Really the Most Important Meal?
Breakfast has no metabolic advantage (3 RCTs). Total calories determine results.
Alcohol & Muscle Growth: Does It Kill Gains?
Alcohol cuts MPS 37% post-workout. 1-2 drinks away from training show minimal impact.
Naturally Boost Testosterone: The Science
T declines 1%/year. 5h sleep drops T 10-15%. Vitamin D raises T 25%. 12 studies.
Does Sweating Mean You're Burning Fat?
Sweating is your cooling system, not a fat-burning indicator. The science explained.
Fat Burning Supplements: Truth or Scam?
Evidence breakdown of popular fat burners. Only caffeine and yohimbine have real data.
Spot Reduction Myth: Can You Target Fat Loss?
8-study review. Crunches don't burn belly fat. A 2023 RCT found a limited exception.
Does Muscle Turn Into Fat When You Stop Training?
Muscle and fat are distinct cell types — neither converts to the other. Biology explained.
Does Cardio Kill Muscle Gains?
Wilson (2012): interference vanishes with moderate volume. AMPK-mTOR conflict explained.
Does Muscle Soreness Mean Muscle Growth?
Zero-soreness group gained equal muscle. DOMS and growth are independent processes.
Can AI Replace a Personal Trainer?
Data-driven analysis: AI coaching vs human trainers — results, adherence, personalization.
AI vs Human Bodybuilding Coach: A Data Comparison
Head-to-head: muscle gain, strength, adherence, and injury rates compared.
Does Stress Kill Your Gains? The Cortisol-Muscle Science
Chronic cortisol above 20 µg/dL blocks mTOR and activates muscle breakdown. 10 studies explained.
Do Ice Baths Kill Muscle Growth? The Science
CWI blunts hypertrophy (Piñero 2024 meta-analysis) but not strength. Optimal: 11–15°C for 11–15 min.
Should You Train to Failure for Muscle Growth?
3 meta-analyses confirm: failure not required. 0–3 RIR = equal muscle, far less fatigue. Complete science.
BCAA Supplements: What the Science Actually Shows
BCAAs trigger mTOR but cannot complete MPS without EAAs. Wolfe (2017) + 8 studies reviewed.
Vitamin D & Athletic Performance: The Deficiency Killing Your Gains
56% of athletes are Vitamin D deficient. Low 25(OH)D cuts muscle strength, testosterone 25%, and raises injury risk. Evidence-based guide with dosing protocols.
Does Eating 6 Times a Day Boost Metabolism? The Myth Exposed
RCTs show 3 vs 14 meals/day = identical energy expenditure. Total calories and protein are what matter, not frequency.