Fitness health/apps: Export personal data from phone (i.e Dafit)

Many apps used by smartbands/watches have no option to export your personal data, so you can't process/visualize, store, or migrate to other app. Also I know that some fitness apps for android apps allow the data export to external files as excel, such as Withings healthmate can sync data with its "cloud/server" and from their webpage you can export data to excel. For *Dafit and other fitness apps* with export/import : Do you know **apps/options/methods to extract its data**? Do you know **apps to process/convert data from different apps** ? /convert this