I have no watch anymore but gadgetbridge was the gold standard a few years ago. I don't think that it has changed. I'd look for a device that is supported by it.
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Older garmin watches will still have all the essentials of heart rate, gps and activity tracking, so you can look into second hand stuff.
You can use any watch who is supported by gadget bridge.
It has an automatic link to an Endurain account.
https://gadgetbridge.org/blog/release-0_92_00/#feature-highlights
Use a Xiaomi watch. It's cheap and let you test your setup without ruining you wallet.
https://www.mi.com/fr/product/xiaomi-smart-band-10-pro/
Or you can use repebble watch. Fully integrated with gadgetbridge because it's open source.
I have a Garmin Vivoactic 6 and I can either use gadgetbridge, or I can just pull it from the watch over USB.
I use a Polar Loop and apparently they have official ways to export raw data but I haven’t tried them yet. I was looking at a Home Assistant addon which would pull it out automatically.
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