Apple has released watchOS 7.2 to the public with an improved ECG function and support for Apple Fitness+.
Apple Watch software updates are usually coupled with changes to the iPhone or a new software feature. In this update, Apple improves the ECG function, adds the VO2 measurement, and brings Apple Fitness+ to the masses.
The update can be applied by opening the Watch app on the paired iPhone, followed by tapping My Watch, then General, then Software Update, then Install. Once downloaded, the app may request the passcode, with the installation taking place while the Apple Watch is on charge.