Any fitness trackers not sending my health data to the USA?

I am looking for a good fitness tracker to start doing cardio in a more measured way.

I was interested in Polar and Oura as EU alternatives (both Finnish companies), but both send data (health data, which is sensitive according to Article 9 of the GDPR) to AWS.

Are you aware of any EU solutions, or at least non-US, Chinese, Russian, or Israeli solutions, that do not send my data to companies in those countries?

I would like to be able to organize something self-hosted, but I don't think I'm capable of doing that yet.