Victoria Song, The Verge:

Starting with watchOS 8, Apple introduced a new accessibility feature called Assistive Touch. The cool thing about this feature is that it allows you to control the watch via gestures and your arm movements. Meaning, now you don’t even need to touch the Apple Watch screen to use it.

And:

Using on-device machine learning, the feature makes use of the watch’s accelerometer, gyroscope, and optical heart rate sensor to read how your muscles and tendons move. The result is that the watch can tell when you’re pinching your fingers or clenching your fists. You can also enable a motion-based cursor that works like a mini-mouse when you tilt your arm.

Great post, love the animated GIFs that show various gestures at work.