The phrase "wrist movements" refers to the actions or motions that you make with your wrist, typically involving bending, rotating, or moving it in different directions. Full definition
In fact, I suggest a minimum 4 - week ramp - up period where the various wrist movement patterns are trained with gradually increasing intensity, prior to doing any bending. (dieselcrew.com)
It measures wrist movements during your sleep, so it can tell when you're in REM mode, or if you wake up in the night. (gizmodo.com)
They are advertised as a good way to be active, but children and teens quickly learn how to play using minimal gestures (for example using wrist movement only). (aboutkidshealth.ca)