Wearfit Android app

[Mjolinor]

There are two applications in the Play Store (Wearfit and Wearfit2) for the Smart bracelets like this:

https://www.ebay.co.uk/itm/F1-Smart-Wristband-Blood-Pressure-Bracelet-Watch-Heart-Rate-Fitness-Tracker/312052854267?hash=item48a7ccadfb:m:m0zYfEN0JiEFNuBBL3a1puQ

Having had a heart attack a few weeks ago I decided to buy one and am really quite impressed for the price.

The only way to get data from the app seems to be in the form of a jpeg picture. Surely the data will be stored on the phone as ascii text and hopefully that will be CSV but I cannot find it anywhere.

Anyone know where the data is or best bet for finding it. I searched for "files newer than" (Linux user) and got nowhere tried a few other things with no success at all.