8 guides
Heart & circulation
Blood pressure, cholesterol, resting heart rate and fitness markers, read against current guidelines.
Tests and markers
What Blood Pressure Reading Counts as Normal for Your Age?
The chart hasn't drawn a different line for age since the guideline last moved, in 2025. What changed that year was which of two identical-looking readings gets treated — and age had almost nothing to do with it.
Strong evidence18 Sept 2026
What Counts as a Good VO2 Max for Your Age and Sex?
Search 'VO2 max chart' and the number for the same age and sex can differ by ten points depending which chart you land on — because a lab gas-exchange test, a submaximal prediction and a wearable's algorithm are three different measurements wearing the same name.
Moderate evidence18 Sept 2026
What Is a Normal Resting Heart Rate for Adults?
Sixty to a hundred beats a minute is the range every clinician quotes, and it hasn't changed in decades — but it was never built to answer whether your particular 54 or 103 is something to watch.
Strong evidence18 Sept 2026
Conditions and symptoms
Is a Resting Heart Rate in the 40s Dangerous, or Just Athletic?
A number that would trigger an alarm on a hospital monitor is unremarkable in a marathon runner's chart. The rate alone can't tell you which case you are — a short list of accompanying details usually can.
Strong evidence18 Sept 2026
What Is White Coat Hypertension, and Does It Still Count as High Blood Pressure?
A cuff that reads 150/95 in the exam room and 118/76 on your own sofa an hour later has not measured two different blood pressures. It has caught the same one on a day when only half the readings included the stress of being measured.
Moderate evidence18 Sept 2026
Nutrients
Explainers
How to Get an Accurate Blood Pressure Reading at Home
The cuff itself is rarely the problem. Posture, arm position, timing and the ten minutes before you sit down account for most of the gap between what you read at home and what a clinician would actually trust.
Strong evidence18 Sept 2026
What Does Heart Rate Variability Actually Measure?
Wearables now hand out a heart-rate-variability score most mornings, styled like a vital sign with one correct answer. The score is real. Whether it means what the app implies, and whether it means the same thing two mornings running, is a narrower question worth separating out.
Moderate evidence18 Sept 2026