Extract of a GPX track generated from an amafit bip

gpx example track.gpx

<?xml version='1.0' encoding='UTF-8' standalone='yes' ?>
<gpx version="1.1" creator="nodomain.freeyourgadget.gadgetbridge.GBApplication 0.35.2" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd" 
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  xmlns:gpxtpx="http://www.garmin.com/xmlschemas/TrackPointExtension/v1" 
  xmlns="http://www.topografix.com/GPX/1/1">
  <trk>
    <trkseg>
      <trkpt lon="-8.406095" lat="43.375107">
        <ele>46.000000</ele>
        <time>2019-08-28T18:12:57Z</time>
        <extensions>
          <gpxtpx:TrackPointExtension>
            <gpxtpx:hr>103</gpxtpx:hr>
          </gpxtpx:TrackPointExtension>
        </extensions>
      </trkpt>
      <trkpt lon="-8.405975" lat="43.375175">
        <ele>46.000000</ele>
        <time>2019-08-28T18:13:11Z</time>
        <extensions>
          <gpxtpx:TrackPointExtension>
            <gpxtpx:hr>107</gpxtpx:hr>
          </gpxtpx:TrackPointExtension>
        </extensions>
      </trkpt>
   ...
   </trkseg></trk>
</gpx>