The library
The reasoning, not the recommendations.
Everything here says where it came from and how confident you should be in it. Where the evidence is thin, the article says so — including when that undercuts something else on this site.
Evidence Room
What the research actually says, and how confident you should be in it.
Grip strength is a biomarker, not a party trick
Hand strength predicts a startling range of outcomes it has no business predicting. Here is why — and why our dead hang test is an imperfect stand-in for it.
3 min readRead →
What a sit-to-rise score actually predicts
A simple floor test tracked mortality across 2,002 adults. Here is what that finding supports, and the part almost every summary of it gets wrong.
3 min readRead →
Three levers for bone density after 50
Walking maintains bone. Heavy loading remodels it. And the single test that tells you where you actually stand is one most adults over 50 have never had.
4 min readRead →
Reading is not measuring.
Ten minutes of tests will tell you more about your own body than anything on this page.
About 10 minutes. No equipment beyond a wall. No sign-up to see your result.