Resting heart rate is the number of times your heart beats per minute when you are genuinely at rest. It is one of the few health markers you can measure yourself, for free, every day, without equipment. It is also one of the most commonly ignored.
How to take it so the number means something
The honest reading is taken before you get out of bed, before caffeine, before the day starts. Sit or lie still for a few minutes first. A reading taken after climbing stairs or arguing with someone is a different measurement entirely. Consistency of conditions matters more than precision of method.
What the range means
Most adults sit somewhere in the sixties or seventies. Fit people are often lower, and trained endurance athletes can be considerably lower without anything being wrong. A number on its own says less than the direction of travel: your own baseline, and what it is doing over weeks, is the useful signal.
Why the trend beats the number
Resting heart rate rises with poor sleep, alcohol the night before, dehydration, illness that has not surfaced yet, and accumulated stress. Many people notice it climbing several beats a day or two before they feel unwell. Tracked over months, a steady upward drift with no obvious cause is worth mentioning to a doctor; a steady decline as fitness improves is the expected reward.
What moves it in the right direction
Regular aerobic activity lowers it reliably over weeks to months, and it is one of the clearest ways to see that training is working when the scale is not cooperating. Sleep, hydration and reducing alcohol all move it. None of this is exotic, which is rather the point.
The limits of a wearable
Wrist devices are good at trends and less good at any single reading, particularly during movement. Use the overnight or early-morning figure and ignore the noise. A device is a useful diary, not a diagnosis.
When to stop tracking and start asking
A resting rate persistently above 100, or below 50 in someone who is not trained, is worth a conversation. So is a heart rate that feels irregular, or that comes with breathlessness, chest discomfort, dizziness or fainting. Those are reasons to be seen rather than reasons to keep a longer spreadsheet.
It is thirty seconds, it is free, and it tells you something true about the week you just had.