Your digital coach — one honest answer a day.

Studio weighs your load and form (fitness, fatigue, form) against your readiness and your own check-in, then answers in words — not just a score. If today’s planned workout clashes with your recovery it suggests an adjustment; you decide.

Your recovery signals are scored against your own rolling baseline with robust z-scores, so one odd night doesn’t swing the call. HRV is read as a 60-day baseline, smoothed against a 7-day rolling average. Where Watch has captured a fresh beat-to-beat reading, Studio reads rMSSD — the stronger readiness marker; without one it falls back to Apple’s native SDNN.

The score weighs your autonomic signals (HRV, resting heart rate, breathing rate, wrist temperature) most heavily, your sleep, and your own check-in a smaller but real share. It also has a hard ceiling: when resting heart rate, breathing rate or wrist temperature drifts more than two standard deviations from your own baseline, readiness is capped — Studio shows the uncapped number too, and names which signal caused it. Both the cap and your check-in can only ever pull the number down, never up.

Estimates are labelled “≈”. On a fresh account Studio tells you it is still building your baseline instead of faking precision. The recovery-deviation cue is a non-medical attention signal — it flags when several signals drift off your baseline together, never illness.

Above the tiles, Studio writes the finding as a sentence you’d actually say out loud — “a textbook Z2 ride, power close to flat.” Tap through and the same finding appears again for the coach: the exact window it was measured on and the rule of thumb next to it, both drawn from the same list of facts. Readiness and HRV findings stay strictly descriptive — no rule of thumb is ever attached to your recovery.

While you ride, Studio mirrors your block, target vs actual power, elapsed and remaining, NP/TSS/kJ on a second screen. The cockpit shows your trends honestly — a zoomed axis is marked, and a thin series says so.

watchOS won’t let an app start its own recording session, so Watch waits for you to run Apple’s own Breathe / Mindfulness session, then reads the beat-to-beat series that session writes to Health and computes rMSSD from it. A fresh series has to end after the measurement started and begin within seconds of it — an old or unrelated series is never used. If no fresh series is there, Watch falls back to a fresh SDNN reading instead, marked ≈ — never shown as if it were rMSSD.

Once enabled, Watch reads the beat-to-beat series it already recorded overnight (22:00–10:00) and sends the median rMSSD of the valid ones as a ≈ night value — but only when there are at least three good readings spanning two hours or more of the night. Too little data and it sends nothing, rather than a value built on scraps. A measurement you take yourself always wins over the automatic one.

Nine complications live there: your readiness ring; a recovery-trajectory arrow showing whether recovery is trending up, flat, or piling fatigue; a one-tap HRV measurement; today’s planned session; your fitness (CTL) and form (TSB) numbers; a one-tap breathing session; a one-tap cold-immersion log; a wake card showing whether you’ve taken this morning’s reading yet; and an HRV-versus-your-baseline word. On watchOS 26, a Control takes you straight into a measurement from Control Center or the action button — no hunting for the app first.