If you delete and reinstall the app, your history records will not be saved. For your privacy, all the app's data gets saved within the app itself and not on our server, so if deleted, it cannot be restored. You can manually add your runs by tapping on progress > and scroll down to my runs > press on "+" and fill your run details (please keep in mind that your past runs & calories will not be transferred).
Keywords to find this article:
progress, history, lost, disappeared, gone