Health Science

Grip Strength as a Longevity Biomarker: The 140,000-Person Evidence

Grip strength is a stronger predictor of all-cause and cardiovascular mortality than systolic blood pressure. Here is the science and what it means for athlete longevity.

5 min read · 2026-09-01

Your Natural Muscle Ceiling Is Not Where You Think It Is — The Science of Genetic Potential

Every lifter eventually hits a progress plateau and wonders if they've reached their genetic ceiling. FFMI gives you an objective reference point — and most athletes are nowhere near it.

5 min read · 2026-08-25

Caffeine Accumulation: The Maths of Four Coffees in One Day

Each cup of coffee doesn't clear before the next one arrives. Caffeine accumulates across doses via half-life stacking. Here's the pharmacokinetics — and why it matters for sleep and performance.

5 min read · 2026-07-07

The 200mg Caffeine Limit in Pregnancy Is Evidence-Based. The Reasoning Behind It Is More Important Than the Number.

Pregnancy suppresses CYP1A2 to 30% of baseline by the third trimester, extending caffeine half-life to 10-18 hours. The WHO 200mg daily limit is well-founded, but the pharmacokinetics explain why timing matters as much as dose.

5 min read · 2026-07-07

Body Composition Measurement Accuracy: DEXA vs BIA vs Calipers

Every body composition measurement method carries systematic error. For athletes — where hydration, muscle density, and bone mineral density deviate from population norms — the error is larger than manufacturers state. Knowing the bias of your tool changes how you interpret the number.

5 min read · 2026-06-30

Caffeine Half-Life: Exactly How Long Caffeine Stays in Your System

8 min read · 2026-04-03