Are there any privacy conscious fitness trackers?

Hi, I'm looking for a fitness tracker that can be used offline and respects privacy. Ideally, I would be able to export the data directly to my PC without connecting to an app or to external servers. It would be even better if I could turn off wifi/GPS at will on the device as well.

The things that are most important to me are, in order:

sleep tracking
spo2 measurements
resting HR
running heart rate
GPS for tracking run lengths …

app data device export external fitness gps important order privacy servers sleep things tracker trackers tracking turn wifi