Activity Trends API

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See the ReactJS front-end here

Apple Health Data

The native iOS Health App produces an XML file containing all the data recorded from relevant devices (Phone, Watch etc.).
My export was ~1GB and ~3million lines, making it slow to de-serialise.

Record

Various <Record></Record> elements store data such as your height, body mass, heart rate etc.

<Record
    type="HKQuantityTypeIdentifierHeight"
    sourceName="Tom’s iPhone X"
    sourceVersion="11.1"
    unit="ft"
    creationDate="2017-10-03 21:35:31 +0100"
    startDate="2017-10-03 21:35:31 +0100"
    endDate="2017-10-03 21:35:31 +0100"
    value="5.67585"
></Record>
<Record
    type="HKQuantityTypeIdentifierBodyMass"
    sourceName="MyFitnessPal"
    sourceVersion="29814"
    unit="kg"
    creationDate="2020-05-15 15:13:45 +0100"
    startDate="2020-05-15 15:13:00 +0100"
    endDate="2020-05-15 15:13:00 +0100"
    value="80.1498"
></Record>
<Record
    type="HKQuantityTypeIdentifierHeartRate"
    sourceName="Tom’s Apple Watch"
    sourceVersion="4.0"
    device="<<HKDevice: 0x280d6bac0>, name:Apple Watch, manufacturer:Apple, model:Watch, hardware:Watch3,4, software:4.0>"
    unit="count/min"
    creationDate="2017-09-28 13:48:11 +0100"
    startDate="2017-09-28 13:23:19 +0100"
    endDate="2017-09-28 13:23:19 +0100"
    value="80"
>
    <MetadataEntry key="HKMetadataKeyHeartRateMotionContext" value="0"/>
</Record>

Workout

Workout records store most of their data in the <Workout></Workout> element as attributes, but there are optional
<MetadataEntry/> elements nested inside subject to the workoutActivityType attribute.

<Workout 
    workoutActivityType="HKWorkoutActivityTypeElliptical"
    duration="16.36445068319638"
    durationUnit="min"
    totalDistance="0"
    totalDistanceUnit="km"
    totalEnergyBurned="177.234"
    totalEnergyBurnedUnit="kcal"
    sourceName="Tom’s Apple Watch"
    sourceVersion="4.0"
    creationDate="2017-10-02 20:10:35 +0100"
    startDate="2017-10-02 19:54:13 +0100"
    endDate="2017-10-02 20:10:35 +0100"
>
    <MetadataEntry key="HKTimeZone" value="Europe/London"/>
    <MetadataEntry key="HKWeatherTemperature" value="53 degF"/>
    <MetadataEntry key="HKWeatherHumidity" value="8300 %"/>
</Workout>

Global Positioning Service Exchange Format (GPX)

Outdoor workouts record the route you took and stores the data in a
GPS Exchange Format .gpx file. An example file is shown below
with only the first 2 track parts included for brevity.

<?xml version="1.0" encoding="UTF-8"?>
<gpx version="1.1" creator="Apple Health Export" xmlns="http://www.topografix.com/GPX/1/1"
    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">
    <metadata>
        <time>2020-08-23T17:40:02Z</time>
    </metadata>
    <trk>
        <name>Route 2020-07-29 3:13pm</name>
        <trkseg>
            <trkpt lon="-2.538323" lat="53.252917">
                <ele>21.476473</ele>
                <time>2020-07-29T13:51:19Z</time>
                <extensions>
                    <speed>1.642115</speed>
                    <course>-1.000000</course>
                    <hAcc>3.723220</hAcc>
                    <vAcc>2.774929</vAcc>
                </extensions>
            </trkpt>
            <trkpt lon="-2.538320" lat="53.252903">
                <ele>22.036276</ele>
                <time>2020-07-29T13:51:20Z</time>
                    <extensions>
                        <speed>1.641947</speed>
                        <course>-1.000000</course>
                        <hAcc>3.388743</hAcc>
                        <vAcc>2.516615</vAcc>
                    </extensions>
            </trkpt>
            ...
        </trkseg>
    </trk>
</gpx>