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Polar is the manufacturer of both chest straps to measure heart rate as well as premium fitness/wearable watches. In particular the Polar H(10-7) and Polar Verity Sense chest straps are often used as a "gold standard" for collecting heart rate data. Using the H10-7 requires many consents and location on to collect data.
Basically account.polar.com has a download data button. More: https://www.reddit.com/r/Polarfitness/comments/pxbbd2/polar_json_export_to_garmin_fit_converter/