RUNNING SCIENCE

The science the coach keeps reading.

Current, evidence-based running research — reviewed, then folded into how RunNerd™ reads your runs. New findings land here first.

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Skip the Toe-Touches: Warm Up Dynamic, Stretch Static Later

Save static stretching for after your run — cold muscle holds can sap strength and don't cut injury risk.

Half Marathon Fueling: The 30-60g Carb Rule That Actually Works

A simple gel schedule for half marathons: start early, repeat often, chase with water only.

Lift Heavy, Not Long: The Strength Formula That Actually Helps Your Running

Two short heavy-ish strength sessions a week boost running economy and roughly halve injury risk.

Why Walk-Run Beats Just Running When You're Starting Out

A 3-day-a-week walk-run plan that grows jog intervals gradually gets beginners to a full mile faster than daily running attempts.

Foot-Core Training Cuts Your Injury Risk by More Than Half

A 2026 review confirms foot-core work is one of the most reliable ways to stay injury-free as a runner.

Why 21 Days Is a Myth: How Long a Running Habit Actually Takes

Real running habits form over ~6 weeks of 3 sessions per week — not 21 days — at an easy, conversational pace.

How Tempo Runs Train Your Body to Clear Lactate Faster

One 20–40 min tempo run per week at comfortably hard effort teaches your muscles to process lactate before it slows you down.

Why Most Marathoners Leave Time on the Table by Under-Fueling

Runners hitting 60–90 g/h of carbs are far more likely to break 3:00 than those averaging the typical 22–35 g/h.

Pyramidal First, Polarized Later: How to Structure a Race Build

Research backs a pyramidal base phase shifting to polarized in the final 6–8 weeks before a 5K–half marathon.

Sleep Is Your Cheapest Performance Drug

Getting under 7 hours of sleep hurts endurance and injury resilience; banking extra sleep before a race actually helps.

Turn Your Cadence Up a Notch and Take Stress Off Your Joints

A 5–10% cadence increase cuts impact forces and joint load without costing you any running economy.

Why Your Easy Runs Are Probably Too Hard

Most runners drift into a moderate-effort no-man's-land on easy days that builds fatigue, not fitness.

Train Hot, Race Fast: How Heat Acclimation Boosts Performance

3–5 weeks of heat training lowers your resting HR, raises VO2max, and speeds you up — even in cool races.

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The Archive

Jun 13, 2026 The Simplest Fix for Overuse Injuries: Step a Little Faster intermediate Jun 13, 2026 The Fourth Pillar of Marathon Fitness: Physiological Durability advanced Jun 13, 2026 80/20 Isn't for Everyone: How to Find Your Marathon Training Sweet Spot advanced Jun 13, 2026 One Extra Hour of Sleep Makes You a Better Runner Tomorrow beginner Jun 07, 2026 Step a Little Faster: How a Small Cadence Bump Cuts Injury Risk intermediate Jun 07, 2026 The long-run HR climb: cardiac drift over the marathon distance intermediate Jun 07, 2026 Why your heart rate creeps up: the real physiology of cardiovascular drift advanced Jun 07, 2026 Why dew point — not air temperature — predicts how hard your run will feel intermediate Jun 07, 2026 Warm up like a runner: dynamic moves now, save the stretching for later beginner Jun 07, 2026 Everyday fueling for runners: eat for the runner you are, not race day beginner Jun 07, 2026 Heat exhaustion vs. heat stroke: the signs runners must not ignore beginner Jun 07, 2026 Why humidity wrecks your pace: the evaporative-cooling breakdown intermediate Jun 07, 2026 How Many Carbs Per Hour for a Marathon (and Why It Takes Practice) intermediate Jun 07, 2026 Why You Fall Apart Late in a Race — and How to Fix It advanced Jun 07, 2026 Strength training for runners: two sessions a week is the whole game beginner May 30, 2026 Adjusting your race goal when it's hot intermediate May 30, 2026 A Small Cadence Bump Does Big Things for Your Joints intermediate May 30, 2026 Does your cadence really need to be 180? What the data says intermediate May 30, 2026 How to find your heart-rate zones without a lab intermediate May 30, 2026 Your first four weeks: a walk-run plan that doesn't break you beginner May 30, 2026 Heat acclimatization: how to train your body for hot races intermediate May 30, 2026 How much sleep do runners actually need? beginner May 30, 2026 How often should you run when you're starting out? beginner May 30, 2026 How slow should your easy runs feel? A beginner's guide to pace beginner May 30, 2026 How to taper for a race without losing fitness intermediate May 30, 2026 Why your long run shouldn't always be your hardest run intermediate May 30, 2026 Durability: The Fourth Pillar of Marathon Performance advanced May 30, 2026 Race-day pacing for your first 5K, 10K, or half intermediate May 30, 2026 Race-week nutrition: carb-loading and what to eat before a race intermediate May 30, 2026 Recovery tools, ranked: foam rolling, massage guns, compression, and ice intermediate May 30, 2026 Rest days: how many do runners need, and what to do on them beginner May 30, 2026 Getting back into running after a long break — without getting hurt beginner May 30, 2026 Why running more (not faster) breaks your plateau intermediate May 30, 2026 Signs you're overtraining — and what to do about it intermediate May 30, 2026 Why Endurance Runners Need More Sleep Than Everyone Else intermediate May 30, 2026 Polarized Training Isn't the Holy Grail for Recreational Runners intermediate May 30, 2026 What 'training adaptation' actually means — you get fitter resting, not running intermediate May 30, 2026 Why running feels impossible at first — and the week it starts to change beginner May 30, 2026 Why everything hurts when you start running — and what's normal beginner May 27, 2026 Why elite runners sleep high and train low — the altitude playbook advanced May 27, 2026 Cold plunges feel great but might cost you fitness — when ice baths actually help advanced May 27, 2026 Deload weeks: why backing off makes the next block stick intermediate May 27, 2026 The easy run that isn't easy — and why the middle is a trap beginner May 27, 2026 Short ground contact time isn't always faster — and neither is low vertical bounce advanced May 27, 2026 Heart-rate drift: what the second half of a steady run is telling you intermediate May 27, 2026 Water alone isn't enough on long runs beginner May 27, 2026 Lactate threshold: the pace you can almost-but-not-quite hold for an hour intermediate May 27, 2026 Long-run development: the slow drift that builds the engine intermediate May 27, 2026 Negative splits aren't a brag — they're physiology advanced May 27, 2026 Mid-run fueling: when carbs start to actually matter intermediate May 27, 2026 The real reason easy mileage matters — you're growing mitochondria advanced May 27, 2026 Why a 16-week plan beats a 16-week grind — the case for periodization advanced May 27, 2026 80/20 training: most of your runs should feel almost too easy intermediate May 27, 2026 Why your tendons aren't ready when your lungs are — returning to running after time off advanced May 27, 2026 RHR and HRV: two numbers that actually mean something beginner May 27, 2026 Sleep is the workout you don't run beginner May 27, 2026 Fitness, fatigue, and form: the three numbers behind a good taper intermediate May 27, 2026 Walk breaks aren't quitting — they're the on-ramp beginner May 27, 2026 Zone 2 isn't the slow stuff — it's the engine beginner May 24, 2026 Cadence isn't about running faster — it's about landing softer beginner

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