Initial description in Russian is available here in the Tutorial acrticle https://habr.com/ru/post/662912/
If you have your FIT files ready in DB format then this repo will help you:
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Coordinate Conversion to convert coordinates from Garmin's 32-bit integer format to usual geographical coordinates (WGS-84)
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Single Route Map to create a single map for the cycling/walking/running/skiing, etc. route
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Speed Map CircleMarker to create a speed map for your activity with points symbology
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Speed Map Line to create a speed map for your activity with line symbology
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Popular segments to calculate the most popular areas or segments for your type of activity based on H3 hexagons within the defined polygon (like disctict, city, region, etc.)
