WatchOS 7.3 adds a "Time to Walk" feature for Apple Fitness + subscribers, along with an audio experience in the Workout app, where practicing users can listen to sentences. Inspirational conversation during their walk.
With this update, ECG (electrocardiogram) function will be supported in Japan, Mayotte, Philippines and Thailand. Meanwhile, the cardiovascular symptom notification feature will also be coming to the above countries as well as Taiwan.

The update also adds new Unity Watch Faces, inspired by the colors of the Lien Phi flag (black, red, and green), with shapes that change during the day in motion. The watch face also comes in black, red, green, and yellow options, or just black + gray.
Here are the details of the watchOS 7.3 update for the Apple Watch:
WatchOS 7.3 is free to download through the Apple Watch app, to update you go to Watch app> General> Software Update. To install new software, Apple Watch needs to have at least 50% battery, it is best to put the device on the charger and keep within range of iPhone.
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