ForjexWhat HRV Measures
Heart rate variability (HRV) is the variation in time between heartbeats. Higher values relative to your own normal often go with good recovery; a drop can follow hard training, poor sleep, illness or stress.
Compare With Yourself
HRV differs a lot between people, so compare today with your own recent baseline, not with someone else's number.
One low reading means little. A trend over several days, especially with a raised resting heart rate and short sleep, means more.
How to Use It
On a low day, keep the session but cut the hardest sets, or swap intensity for technique work.
On a high day, it is a reasonable day to attempt a heavy top set.
What It Cannot Tell You
Readiness is a guide, not a diagnosis. If you feel unwell, rest regardless of the number, and see a doctor for symptoms that concern you.