Recently Apple showcase double tap finger gesture that help to take action such as recive call and end call by using thumb and index finger.
How can i use double tap gesture on Apple Watch Series 9
You can customize your need of double tap gesture feature on your watch by doing index and thumb finger tap two times.
What can I do with double tap gesture on Apple Watch Series 9
- For instance, you can use the Double tap function to stop a timer in the Timer app, play/pause music in the Music app, receive/end calls, snooze an alarm, and more.
- Also, double-tapping from the watch face will launch Smart Stacks, and you can keep double-tapping to scroll through Smart Stacks.

This feature only available in latest watch series 9 and ultra 2 watches. Just beacuse the latest S9 SIP Processor and Advanced Nerual Engine.
The double tap gesture is an excellent way to keep using it for small actions when your hands are occupied with other stuff. Besides the new Double tap gesture, Apple also introduced various new features to the Apple Watch Series 9 and Apple Watch Ultra 2.