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Navigate to: https://flow.polar.com/diary/training-list and select the date range of activities you want, and pick show all in drop down.
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Open the developer tools in your browser, e.g in Google Chrome "Control + Alt + I" on Windows or "Option + Command + I" on Mac
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Copy/paste below JS into console
function extractActivityIds () {
let LIST_SELECTOR = '#Flow > div > div > main > div > div:nth-child(3) > div:nth-child(1) > div.row.history-list__row.history-list';