For this exercize, I'm using GPX data from Strava. Strava's free account allows you to download/export GPX-formatted data.
This is self-explanatory
For each exercise activity you do, you can export it's GPX-formatted data as shown in the screenshot below...
GPX data is in XML format. It's a highly descriptive, easily parsible format.
<?xml version="1.0" encoding="UTF-8"?>
<gpx creator="StravaGPX iPhone" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.topografix.com/GPX/1/1 http://www.topografix.com/GPX/1/1/gpx.xsd" version="1.1" xmlns="http://www.topografix.com/GPX/1/1">
<metadata>
<time>2020-11-20T00:03:18Z</time>
</metadata>
<trk>
<name>Afternoon Ride</name>
<type>1</type>
<trkseg>
<trkpt lat="39.6271650" lon="-104.8685840">
<ele>1713.8</ele>
<time>2020-11-20T00:03:18Z</time>
</trkpt>
<trkpt lat="39.6271630" lon="-104.8686280">
<ele>1713.8</ele>
<time>2020-11-20T00:03:19Z</time>
</trkpt>
Each GPS entry is a "track-point" (i.e. <trkpt>). The entry includes latitude, longitude, elevation, and timestamp.
This is still a work in progress.