Yes: connect WHOOP in Settings and Rhythm reads your recovery signals from it to adjust how confident today's suggestion is, never the weight you are asked to lift.
WHOOP connections are in an early-access window today. A limited number of seats are open, so a connection can be refused if the window is full when you try to connect, and more seats open as the integration grows — try again if that happens.
Once connected, Rhythm reads a daily summary: heart-rate variability (the beat-to-beat change in your heart rhythm) in milliseconds, resting heart rate, sleep, breathing rate, workout calories, and your daily and per-session activity-intensity values. The connection tokens are exchanged and stored on our servers, encrypted, never in the app bundle; disconnecting removes them along with the stored daily snapshots.
Confidence, not load. Clear and consistent signals mean today's suggestion is offered with more of it; thin signals, or two devices that disagree, mean Rhythm says so instead of guessing. Your working weights come from the sets you have actually logged, and nothing a wrist strap sends changes them.
Rhythm never displays WHOOP's own recovery, exertion or sleep-quality scores. Those stay in the WHOOP app. What Rhythm shows you is its own plain-language read on your day, built from the raw measurements, not WHOOP's scoring.
WHOOP's overnight temperature reading does reach Rhythm, but it never sets your phase. At most it changes how a cycle estimate is worded, and only with hedged, medium confidence, because a wrist sensor has no validation study behind it for this. Your cycle dates and phase are worked out on your phone and are never sent to our servers, whatever you connect. And a wearable is optional: Rhythm reads your training log first, so it works with nothing connected at all.