Ah that’s awesome - thank you for sharing (and supporting Bart)!
I’ll be curious to see the finished product when it’s up as I’ve thought about doing something similar for keeping track of my own workouts. Currently I have a folder with a file for each day (Mon-Fri) and one for videos, and I open it as a project in a text editor.
The days have my exercises with columns for:
Week Number - Weight - Reps - Notes
It’s just to keep track of progressive overload, but could make a nice app with cool graphs/stats etc. Ideally it would output or keep a set of plain text files too. I have found over the years I much prefer plain text (even if just as a back up) as that is always portable and not subject to OS/vendor-lock-in. I wish more apps offered this. Good luck with your project - keep us posted on how you get on! 
