This article explains the hand gestures available on different Apple Watch models. We'll walk you through enabling and customizing the gesture settings for Apple Watch models running watchOS 10.1 or later.
How to Enable Apple WatchOS 8 Assistive Touch to Use Hand Gestures
If you own an Apple Watch Series 9 or Apple Watch Ultra 2, you can take advantage of the built-in double-tap hand gesture.
Double Tap means tapping your thumb and index finger together twice. You can use this gesture to open the Smart Stack app, which you normally open by swiping up from the bottom of the screen, and control the playback of audio such as music and podcasts.
Fortunately, you can also customize how the double-tap gesture works on your Apple Watch by following these steps: