HRV vs resting heart rate: a simple decision rule for hard training days

If your Garmin HRV dips but resting heart rate looks normal, most athletes guess. Better rule: decide from trend + training context, not one morning value.

Use this simple model: green day when HRV is stable over 7 days and resting HR is within baseline; yellow day when one metric drifts; red day when both drift and your last 72h Strava load was high.

Practical example: planned threshold session on a yellow day? Keep quality but cut total intervals by 20%. Planned intervals on a red day? Switch to Zone 2 and protect consistency.

At CoachUpFit, we treat HRV and resting HR as execution signals. The goal is not to avoid hard training — it's to place it where adaptation is highest.