The Apple Watch Ultra 4 introduces a dedicated “Readiness” bezel configuration designed to help athletes track recovery metrics directly from the watch face, according to Apple’s September 2026 product announcements. This new bezel option integrates with the device’s updated Health Sensing System to display continuous physiological data.
Understanding the Readiness Bezel Configuration
The Readiness bezel option wraps four bars around the edge of the watch face to display different score categories. A single dot indicates where a user’s score fits within a specific category, and only the category with the active score remains illuminated. Apple confirmed that watch faces like Modular Ultra and the new Siri Modular face support this display layout.
Because physiological readiness can fluctuate throughout the day, having the metric visible on the main watch screen allows users to monitor their recovery status continuously. The feature relies on data gathered by the redesigned hardware, which measures metrics at a much higher frequency than previous generations.
Health Sensing System and Vitals Tracking
Apple Watch Ultra 4 features a re-architected Health Sensing System equipped with new optical and electrical heart sensors, alongside larger and more power-efficient green LEDs. According to Apple’s specifications, the device measures heart rate every five seconds throughout the day. Overnight vitals tracked by the system include heart rate, respiratory rate, wrist temperature, and recovery heart rate variability (HRV). Daytime vitals track heart rate and recovery HRV.
The S11 chip powers these frequent background checks, capturing background heart rate readings up to 60 times more frequently than the Ultra 3. Recovery HRV—identified as a key indicator for stress and recovery—is measured up to 24 times more often than on the prior model, with readings occurring as frequently as every five minutes.
Watch Face Customization and Display Options
Beyond the new Readiness metric, Apple Watch Ultra models offer distinct customization features compared to standard Series devices. Users can configure specialized Ultra-only watch faces, select unique colors and fonts, and utilize various bezel-type complications, including Seconds, Depth, Elevation, Training, and None.
The Ultra 4 expands these choices by adding Readiness to the bezel configuration category alongside existing options. Both the Apple Watch Series 12 and Ultra 4 are available now, with pre-orders beginning following Apple’s September product launch.
Pro Tip: If you want to keep a close eye on your daily recovery without opening menus, switch your watch face to Modular Ultra or Siri Modular and select Readiness for your bezel complication.
Frequently Asked Questions
What metrics are included in overnight vitals on Apple Watch Ultra 4?
Overnight vitals include heart rate, respiratory rate, wrist temperature, and recovery HRV.
How often does the Apple Watch Ultra 4 measure heart rate?
The device measures heart rate every five seconds, all day long.
Which watch faces support the new Readiness bezel configuration?
Watch faces such as Modular Ultra and the Siri Modular face support displaying the bezel configuration.
What finishes are available for the Apple Watch Ultra 4?
The watch is available in two aerospace-grade titanium finishes: natural and black titanium.
Explore More
Have you tested the new Readiness bezel on your Apple Watch Ultra 4 yet? Let us know your thoughts in the comments below, and check out our other coverage on the latest watchOS features and health tracking updates.