[andrewcooke]

the garmin data actually is in an open format. i've written software to decode it using publicly available documentation. the software is free to use. you can copy the (.FIT) file off the watch over USB.

[rconti]

What about non-activity data, such as step counts, sleep data, pulse ox, etc?

[snovv_crash]

That's all postprocessed from the raw data. And the raw data is in the .fit file.