About KnowYourPrime

Your watch tells you your HRV was 38 last night. Your ring gives you a recovery score of 64. Your phone says your VO2 max is "above average for your age." None of them tell you what any of that actually means, whether 38 is worth a second thought, or what would move it if you wanted it to move.

That gap is why we built this. The devices are good at measuring and not good at explaining. They hand you a number and a green-yellow-red and leave you to guess at the rest.

KnowYourPrime is the part that does the explaining. We read the research on the numbers your wearable gives you, gather it into one place, and lay out what is actually known: what is normal for someone your age, what has been shown to move each number, and where the science still doesn't have a clean answer. You read your own numbers and draw your own conclusions. We don't tell you what to do with them.

What we are

Independent. We are not owned by a wearable company and we don't sell a device, a supplement, or a program. There is no product whose sales depend on your number looking a certain way. That independence is the whole point. We have no reason to tell you your recovery score should be higher except where the research actually says something.

Evidence-led. Every claim we make about what a number means, or what moves it, traces back to a named source. We read the actual studies instead of summarizing other people's summaries. Where the evidence is strong, we say so plainly. Where it is mixed, we say that too, because pretending the science is settled when it isn't is the fastest way to lose your trust. How the sourcing works in detail is on our methodology page.

Interpretation, not instruction. This is the line we hold hardest. We explain what the research connects to each metric. We do not tell you to do anything. "People in the trial who drank within three hours of bed had lower overnight HRV" is the kind of thing you'll read here. "Stop drinking before bed" is not, because that is a decision only you, and where it matters your doctor, can make. We give you the reading. You make the call.

Who writes it

The articles are written under the name Kate Maren, our editor. Kate is not a doctor and not a scientist, and we never pretend otherwise. She is the person who gets curious about a number she doesn't understand and reads the studies until it makes sense, then writes it up the way she'd explain it to a friend over coffee. The credibility here isn't a credential. It's that every claim is sourced, the strength of the evidence is stated honestly, and the limits are named out loud.

How we make it

We use AI tools in researching and drafting articles. Every published article is reviewed and edited against its sources before it goes up, and the standard is the same whether a sentence started with a person or a tool: if a claim can't be traced to a real study, it doesn't run. Our methodology page explains the full process.

What we cover

We're narrow on purpose. We interpret the metrics wearables actually report: heart rate variability, resting heart rate, sleep, and VO2 max. The metrics are narrow. What influences them is broad, which is why the research reaches into sleep, stress, alcohol, illness, training, age, and sex. A number rarely moves for one reason, and we treat it that way.

What we are not

We are not medical advice, not a diagnosis, and not a substitute for talking to your own doctor about your own situation. We report what published research has found. What you do with that is yours to decide.

If you came here because a number on your wrist changed and you wanted to know what it meant before deciding whether to care, you're in the right place. That's the whole reason we're here.