Knowledge
How a recovery score is built, what Apple Watch measures as HRV at night, and how to adjust your training on a bad day — the background, without product comparisons and without marketing promises.
KNOWLEDGE
What Apple Watch measures as HRV at night
How Apple Watch records heart rate variability, how often it measures, and why the number moves from one night to the next.
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SDNN vs. RMSSD: the difference in HRV
What SDNN and RMSSD each calculate, why Apple Health reports SDNN, and why values from the two metrics cannot be converted into each other.
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How a recovery score works
How HRV, resting heart rate and sleep become a value from 0 to 100 – and why your own 30-day norm is what counts, not a reference table.
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Adjusting training when recovery is low
On weak days cut sets first, then the weight – and only take a rest day last. How LeibFit ties volume and progression to your recovery.
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Look at your own numbers
Recovery, sleep and load from the watch you already wear — training plan included.
LeibFit Premium
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iPhone · iOS 17.6+ · 7 days free, no subscription