Performance
I Ran for Three Years and Got Slower — Here Is What the Research Says About Why
Most recreational athletes train exclusively in the grey zone between easy and hard, which drives...
Zone 2 Training: Why Going Slower Gets You Fitter, Faster
Most people spend zero time in Zone 2 -- the metabolic sweet spot that builds mitochondrial density,...
150 Minutes of Weekly Exercise Cuts Cardiovascular Death Risk in Half -- But Most People Are Doing the Wrong Kind
A 2022 meta-analysis of 30 million people found 150 minutes of weekly exercise cuts cardiovascular death...
Rhodiola Rosea: The Adaptogen for Fatigue, Stress, and Mental Performance
Unlike ashwagandha, rhodiola trains your biology to resist stress rather than suppress it. Here's what the...
Heat Acclimation: The Overlooked Performance Edge
Deliberately training your body to handle heat produces measurable physiological adaptations—some of which...
Zone 2 Cardio: The Longevity Workout, Fact-Checked
Zone 2 - easy, conversational cardio - is a longevity favorite. The fitness-and-mortality link is rock...
Heart Rate Variability: Training by Your Nervous System
Heart rate variability promises a window into your recovery and readiness—but it's noisier, more personal,...
Beetroot, Nitric Oxide, and Endurance
Dietary nitrate from beets can genuinely improve exercise economy and endurance—but the size of the...
Beta-Alanine and the Science of the Burn
The tingly amino acid behind countless pre-workout powders has a real, if narrow, performance effect—and...
VO2 Max: The Strongest Predictor of Lifespan
Among all the biomarkers people track, cardiorespiratory fitness may be the single most powerful predictor...