stress.
this pillar isn't asking how you feel. it reads how well your autonomic signals settle — and it scores regulation, so a higher number means your body is handling the load, not that you're under more of it.
what feeds it
- heart-rate variability, the leading signal
- resting heart rate and respiratory rate, both weighted lower — the same autonomic tone shouldn't count three times
- all of it compared against your own recent baseline, with the long-run variability held steady so a single rough week can't move the goalposts
what it needs
the same thing recovery needs: an apple watch, and enough nights of it to establish what your normal looks like. the two pillars read overlapping signals, which is exactly why their weights are deliberately kept apart rather than allowed to double-count.
what it can't see
psychological stress that doesn't show up autonomically is invisible here, and so is the reverse — a hard training block can look like stress because physiologically it is. mood, journal entries and breathing sessions are shown in your day's timeline but are deliberately not scored: self-report and physiology measure different things, and averaging them would make both less useful.
one honest number, every morning.
sate reads what your iphone and apple watch already collect, and what you log in seconds, and answers with a single score you can act on.
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