On a mission to the ISS in early 2024 the Swedish ESA astronaut Marcus Wandt was equipped with a wearable called "actibelt".

esa.int/Newsroom/Press_Releases/ESA_astronaut_Marc...

It is a multisensor device with accelerometers, gyroscopes, magnetometers and pressure sensors, embedded in a flexible belt buckle, to capture and analyze the astronaut's movements and exercises. This is a follow-up of a series of feasibility studies starting in 2007, with the goal determine if the actibelt can be used to quantify the activity profile and energy consumption of human participants while in a micro- or partial-gravity environment.

ntrs.nasa.gov/api/citations/20080015863/downloads/... (p137).