Why RHz recommends a chest strap
Resonance-breathing biofeedback depends on the timing between individual heartbeats. A chest-strap ECG monitor such as Polar H10 provides a strong signal source for that workflow.
RHz is not affiliated with or endorsed by Polar. The recommendation describes the hardware setup used for the strongest RHz experience.
Pairing and first-session basics
Wear and activate the strap, enable Bluetooth on your Android device, open the RHz sensor scanner, and link the monitor from inside the app. Then choose a Full Sweep for broad discovery or Quick Tune for a shorter focused check.
What other sensors can do
WHOOP 5.0 has also been tested. Other Bluetooth monitors may connect, but connection alone does not confirm measured HRV support. Choose a monitor that broadcasts actual beat-to-beat RR intervals. RHz estimates intervals from heart-rate-only feeds; those estimates are not equivalent to measured intervals.
Continue learning
Review the setup guide, compare ECG and PPG sensors, or return to the RHz overview.