Fitness
Follow Fitness in the Factlen app and get an alert when there is news. Get the app
Explainer
The Physiology of Energy Expenditure: Comparing BMR, NEAT, and Exercise for Calorie Burn
6 sources · 52d ago
Explainer
How Cycling Power Meters Measure Watts With Strain Gauges and Calculate TSS
5 sources · 52d ago
Explainer
Why HIIT and MICT Trigger Entirely Different Physiological Adaptations
6 sources · 52d ago
More in Fitness
ExplainerProtein Synthesis
Distributing Protein Evenly Across Meals Boosts Muscle Protein Synthesis by 25%
Distribution Optimizers 40%Total Daily Intake Advocates 40%Plant-Based Nutritionists 20%
ExplainerLoad Carriage
The Biomechanics of Load Carriage: How Proper Backpack Fit Minimizes Injury and Energy Expenditure
Biomechanical Researchers 40%Military Ergonomists 30%Clinical Practitioners 30%
ExplainerTraining Science
Comparing RPE and RIR to Autoregulate Intensity for Strength and Hypertrophy
Sports Science Researchers 60%Practical Strength Coaches 25%Editorial Synthesis 15%
ExplainerNervous System
The Neuroscience of Yoga: How Breath and Movement Shift the Autonomic Nervous System
Clinical Neuroscientists 45%Clinical Yoga Therapists 35%Integrative Health Analysts 20%
ExplainerVibration Therapy
Vibration Plates Aid Bone Density in Older Adults but Offer Minimal Fat Loss
Clinical Rehabilitation Specialists 45%Strength and Conditioning Coaches 35%Commercial Fitness Manufacturers 20%
ExplainerCold Exposure
Why Cold Water Immersion Blunts Muscle Growth While Aiding Acute Recovery
Hypertrophy & Strength Advocates 40%Endurance & Performance Athletes 40%Clinical Researchers 20%
Research BriefTraining Science
Matching Periodization to Competition Schedules Matters More Than Physiological Stimulus
Undulating Advocates 40%Traditionalists 35%High-Performance Coaches 25%
Research BriefFlexibility Science
PNF Delivers 56% Greater Flexibility Than Static Stretching for the Same Strength Cost
Static Stretching Proponents 45%PNF Stretching Proponents 45%Strength & Power Athletes 10%
ExplainerTapering Science
Why Tapering Triggers Physiological Supercompensation in Competitive Swimmers
Physiological Researchers 40%Sports Psychologists 30%Coaching Practitioners 30%
ExplainerHypertrophy Science
Longer Rest Periods Drive Superior Muscle Growth by Preserving Volume Load
Volume-Load Proponents 45%Time-Constrained Lifters 30%Metabolic Stress Advocates 25%
Exercise PhysiologyMedical Breakthrough
Study Identifies 'Training Molecule' That Induces Muscle Growth Without Exercise
Molecular Physiologists 40%Public Health Advocates 35%Chronic Disease Specialists 25%
Player SafetyPolicy Decision
NFL and NFLPA Finalize New Player Safety Rule Imposing Suspension for Three Violations
League and Union Leadership 45%Defensive Players and Analysts 35%Sports Medicine Experts 20%
ExplainerCore Biomechanics
The Biomechanics of Pilates: Why Deep Core Activation Outperforms Traditional Exercises for Lower Back Pain
Clinical Biomechanists 40%Rehabilitation Physiotherapists 40%Traditional Strength Coaches 20%
ExplainerMuscle Recovery
The Science of Delayed Onset Muscle Soreness (DOMS): What Causes It, and What the Evidence Says About Mitigation
Sports Physiologists 40%Clinical Therapists 30%Evidence-Based Nutritionists 30%
ExplainerHeat Adaptation
The Physiology of Heat Acclimatization: How the Body Adapts to Heat Stress and the Evidence-Based Protocol
Sports Physiologists 40%Public Health Advocates 35%Passive Adaptation Proponents 25%
ExplainerSports Science
Foam Rolling Increases Flexibility by Altering Neurological Pain Tolerance
Neurological Focus 45%Evidence-Based Coaches 35%Traditional Mechanical Therapists 20%
ExplainerHypertrophy Science
Stretch-Mediated Hypertrophy: Why Training at Long Muscle Lengths Maximizes Growth
Evidence-Based Hypertrophy Researchers 45%Traditional Strength Coaches 35%Biomechanics Skeptics 20%
Deep DiveDietary Science
How Intermittent Fasting Compares to Continuous Calorie Restriction for Weight Loss and Metabolic Health
Time-Restricted Eating Advocates 35%Traditional Dietitians 35%Clinical Metabolic Researchers 30%
ExplainerRunning Economy
Heavy Resistance and Plyometric Training Improves Running Economy and Speed
Exercise Physiologists 35%Strength and Conditioning Coaches 35%Traditional Endurance Coaches 30%
ExplainerAutonomic Nerves
How Aerobic Exercise Rewires the Heart's Autonomic Nerve Network in a Side-Specific Way
Clinical Cardiologists 40%Exercise Physiologists 35%Neuroanatomy Researchers 25%
Cycling TechRule Change
UCI's Sweeping 2026 Technical Overhaul Mandates Minimum Handlebar Widths, Caps Wheel Depth, and Limits Frame Aerodynamics
Equipment Brands & Aerodynamicists 35%Bike Fitters & Rider Advocates 35%UCI Regulators & Safety Committee 30%
Corporate LitigationLegal Resolution
Federal Judge Dismisses $12.5 Billion Shareholder Fraud Lawsuit Against Peloton
Corporate Defense 55%Defrauded Shareholders 45%
ExplainerCreatine Science
Creatine's New Frontier: Studies Show Supplement Boosts Cognition and Brain Energy Under Metabolic Stress
Cognitive Researchers 45%Skeptical Methodologists 35%Factlen Editorial Team 20%
ExplainerPublic Land Access
Tenth Circuit Legalizes Corner Crossing to Open 8.3 Million Acres of Western Public Land
Public Land Access Advocates 60%Collaborative Land Managers 40%
ExplainerMetabolic Health
How a Ketogenic Diet Unlocks Exercise Benefits Blocked by High Blood Sugar
Exercise Physiology Researchers 40%Clinical Nutritionists 35%Public Health Advocates 25%
ExplainerRecovery Science
Repurposed Arthritis Drug Meloxicam Counters Muscle Loss by Activating Dual Metabolic Pathways
Pharmacological Interventionists 50%Traditional Sports Scientists 50%
ExplainerSupplement Regulation
Federal Bill Seeks to Block State Laws Imposing Age Restrictions on Muscle-Building Supplements
Federal Uniformity Supporters 35%Supplement Industry Advocates 35%Public Health Proponents 29%
ExplainerHealth Policy
How Australia's Reinstated Private Health Rebates for Pilates Actually Work
Clinical Rehabilitation Providers 40%Private Health Funds 35%Fitness Industry Advocates 25%
ExplainerPulmonary Rehab
Low-Load Blood Flow Restriction Training Reduces Ventilatory Stress in COPD Patients, Opening New Rehab Pathway
Clinical Researchers 40%Pulmonary Rehabilitation Specialists 35%COPD Patients 25%
ExplainerE-Bike Regulation
Utah Establishes New Legal Classifications for E-Bikes and High-Powered Electric Devices on Public Lands
Public Safety and Law Enforcement 40%Trail Conservationists 30%E-Bike Advocates 30%
ExplainerGLP-1 Access
Medicare Begins Coverage of GLP-1 Drugs for Obesity: Comparing the New $50 Bridge Program vs. Cash-Pay Alternatives
Federal Health Agencies 39%Patient Advocates 39%State & Private Payers 22%
Shoe Regulations
World Athletics Quietly Ends 'Widely Available' Rule, Approving Prototype 'Development Shoes' for Elite Competition
Shoe Manufacturers 40%Athletics Regulators 35%Everyday Runners 25%
ExplainerAnti-Doping Rules
2027 WADA Code Overhaul Finalized: Major Changes to Sanctions, TUEs, and 'Contaminated Source' Defense
Anti-Doping Regulators 40%Legal Advocates 35%Sports Federations 25%
AnalysisSports Economics
The Economics of Pro Cycling: WorldTour Tradition vs. the 'One Cycling' Franchise Model
Traditionalists & Governing Body 50%Franchise Reformers 50%
Fitness GuidelinesPolicy Decision
ACSM Retires 'Health/Performance Divide,' Elevates Neuromotor Fitness to Core Pillar
Clinical Exercise Professionals 40%Active Aging Advocates 35%General Fitness Industry 25%
ExplainerExercise Mimetics
Engineered Myografts vs. Pharmacological Mimetics: The Science of Replicating Exercise
Regenerative Medicine Researchers 40%Pharmacological Developers 35%Clinical Gerontologists 25%
ExplainerAddiction Recovery
Study Finds Yoga Halves Severe Opioid Withdrawal Period, Driving Integration into Recovery Programs
Clinical Researchers 45%Addiction Treatment Providers 35%Public Health Advocates 20%
Anti-Doping PolicyRule Change
WADA Cuts Mandatory Blood Collection Wait Time for Athlete Biological Passport to 60 Minutes
Athlete Advocates & Competitors 45%Anti-Doping Scientists 40%National Testing Agencies 15%
Deep DiveLongevity Science
Flexibility is a Major Longevity Factor: Study Links Poor Range of Motion to 5x Higher Mortality
Cardiovascular & Strength Advocates 35%Mobility & Flexibility Researchers 35%Holistic Longevity Clinicians 30%
ExplainerAging & Mobility
Just Four Minutes of Daily Strength Training Quadruples Mobility Gains in Adults Over 65
Clinical Researchers 40%Public Health Officials 30%Exercise Physiologists 30%
Boutique FitnessMarket Contraction
Boutique Fitness Giant Xponential Forecasts Revenue Decline amid Market Contraction
Market Analysts 40%Franchise Management 30%Independent Operators 30%
Space MedicineClinical Trial
ESA Launches EasyMotion-2 Experiment to Test Electrical Muscle Stimulation for Astronauts
Aerospace Medicine Researchers 40%Clinical Therapists 30%Aerospace Engineers 30%
Gym IndustryMarket Correction
Planet Fitness Faces Securities Fraud Lawsuit Following 31% Stock Drop and Marketing Misstep
Investors and Analysts 40%Planet Fitness Management 30%Casual Gym-Goers 30%
Public LandsPolicy Explainer
What the Roadless Rule Repeal Actually Means for Outdoor Recreation
Conservation & Wildlife Groups 40%Active Management Advocates 35%Local Recreation & Policy Observers 25%
GLP-1 DosingTrade-Off Analysis
Novo Nordisk Sues Eli Lilly Over GLP-1 Advertising and Dosing Comparisons
Direct Comparison Advocates 35%Maximum Efficacy Proponents 35%Clinical Pharmacists 30%
ExplainerStress Biology
How Aerobic Exercise Rewires the Body's Long-Term Stress Response
Clinical Researchers 40%Medical Consensus 30%Fitness Analysts 30%
Per page