Hold , and select Health & Wellness > Wrist Heart Rate.

Status

Enables or disables the wrist heart rate monitor. The default value is Auto, which automatically uses the wrist heart rate monitor unless you pair an external heart rate monitor.

NOTE: Disabling the wrist heart rate monitor also disables the wrist-based pulse oximeter sensor.

While Swimming

Enables or disables the wrist heart rate monitor during swimming activities.

Abnormal Heart Rate Alerts

Allows you to set the watch to alert you when your heart rate exceeds or drops below a target value (Setting an Abnormal Heart Rate Alert).

Broadcast Heart Rate

Allows you to begin broadcasting your heart rate data to a paired device (Broadcasting Heart Rate Data During an Activity).