What RHR is a fairly good indicator of is how rested you are, so if you monitor it you can learn how well your body is adapting to the training load you are putting it through.
HRV is a better measurement.
@hippy started
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What RHR is a fairly good indicator of is how rested you are, so if you monitor it you can learn how well your body is adapting to the training load you are putting it through.