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4 guidesHow the Widmark BAC Formula Works (and Its Limits)
Understand Blood Alcohol Concentration, the Widmark formula behind BAC estimates, why men and women differ, and why no estimate can ever clear you to drive.
23 Jun 2026
5 min read
MET Values and How Calories Burned Are Estimated
What a MET is, the formula behind calories-burned estimates, why weight and intensity matter, and how accurate these numbers really are.
23 Jun 2026
5 min read
Heart Rate Zones Explained: Max HR, Karvonen and Training
A clear guide to heart-rate training zones — how to estimate your maximum heart rate, what the five zones mean, the Karvonen method, and how to train by them.
23 Jun 2026
5 min read
What Is Fitness Age? VO₂ Max and Your Real-vs-Fitness Age
A plain-English guide to fitness age: what VO₂ max measures, how it maps to an age, why cardiorespiratory fitness matters, and how to lower your fitness age safely.
23 Jun 2026
5 min read
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