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Readiness, recovery and strain: what wearable scores actually measure
Readiness, recovery, strain, body battery: every wearable has its own word for roughly the same idea. Strip away the branding and you find a small set of overnight signals, collapsed into one number you read before you decide how hard to push. Here is what actually goes into that number, what HRV really is, and how to read a score without letting it run your day.
The same idea, four names
Oura calls it Readiness. Whoop calls it Recovery. Garmin calls it Body Battery. The labels compete, but the underlying move is identical: take a handful of things your body did overnight, weigh them against your own recent baseline, and hand you a single figure on a 0-100 scale. A high number is the device saying “you look recovered, you can push”; a low one is “ease off, you are still paying back a debt”.
The point is not the maths, which is proprietary and varies by brand. The point is the philosophy: one clear number beats ten dashboards you never read. That is a good idea. It is also the idea Soren borrows, and points somewhere different.
What HRV actually is, in plain language
Heart-rate variability sounds technical, but it is simple. Your heart does not beat like a metronome. The tiny gaps between beats stretch and shrink from one beat to the next, and HRV is just how much that gap varies. Counter-intuitively, more variation is usually the good sign: it means your nervous system is relaxed and responsive rather than stuck in a braced, fight-or-flight gear.
When you are well rested, calm and recovered, the gaps wander freely and HRV is high. When you are stressed, under-slept, fighting something off or hungover, the rhythm tightens and HRV drops. That single overnight reading is why a wearable can sometimes tell you that you are run down before you consciously feel it.
What goes into the number
Most readiness and recovery scores lean on the same four ingredients, measured while you sleep and compared with your personal baseline rather than a population average. Roughly, the weighting looks like this:
In plain terms: HRV reads how recovered your nervous system looks; resting heart rate climbs when you are stressed, ill or under-recovered; sleep rewards both how long and how deeply you slept; and prior-day strain is the load you are still paying back. Stack a short night on top of a hard session and the number drops. Sleep well after an easy day and it climbs.
The percentages above are illustrative, not measured. No mainstream wearable publishes its exact formula, and the real weighting shifts with your own history.
How to read one without obsessing
The single most common mistake is treating a daily score as a verdict. It is not. It is a noisy estimate built from a few signals, and the clear way to use it is to read the trend, not the digit.
- Trend over single days. One low morning means almost nothing. A three- or four-day slide downward is the signal worth acting on.
- Context over the number. A 58 after a late flight and a glass of wine is not a mystery to solve - it is exactly what you would expect. The score is most useful when it surprises you.
- Direction, not decimals. The difference between a 71 and a 74 is noise. Up, flat or down is the only resolution worth trusting.
The limits, honestly
These scores are estimates, not measurements of recovery itself - which nobody can measure directly. A wrist or finger sensor infers a lot from a little, and it can be thrown by alcohol, illness, a hot room, a restless partner or just a poor sensor contact. Sleep staging in particular is modelled, not observed, and even good devices disagree with a clinical sleep lab.
None of this makes them useless. It makes them a mirror, not an oracle. A score is at its best when it confirms a pattern you half-suspected and nudges you to rest. It is at its worst when you let a low number ruin a day you actually feel fine in.
Where Soren fits
Soren takes the same single-number philosophy and points it at the one thing the rings and straps ignore: your mind. Instead of scoring your body’s recovery, it folds three pillars - Focus (your deep-work time in the lock-in), Sleep(auto-detected from your iPhone’s motion, no watch needed) and Physical (HealthKit movement) - into one daily 0-100 Soren Score, with the weights published: see how the Soren Score works.
- On-device, by design. The score is computed entirely on your iPhone. No account, no servers, nothing leaves the phone.
- No subscription to see your own data. The number is yours the moment it is calculated - not gated behind a monthly membership.
- Honest about estimates. Sleep stages are modelled and written to Apple Health as estimates, never presented as clinical fact.
Same idea as the wearables, then: one number, read as a trend, treated as a reflection rather than a ruling. The difference is what it counts, and that it never leaves your pocket to count it.
Weightings and examples here are illustrative and reflect the general approach of consumer wearables as of June 2026, not any single product’s formula. Nothing here is medical advice. If we have something wrong, tell us at hello@sorenlabs.xyz and we will fix it.
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