What heart rate variability can and can't tell you
What the number measures, why it moves around, and where its limits are.
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What this covers
What the number measures, why it moves around, and where its limits are. The final article should open with the main point and say who it is for.
What the evidence says
Summarise the findings here and link to each source so readers can check it.
What to do with this
Close with two or three practical steps, and a reminder to speak with a doctor about personal health questions.