the app version also has facebook & google trackers embedded into it:

https://reports.exodus-privacy.eu.org/en/reports/com.onlyoffice.documents/latest/#trackers

Its a great intro to a more privacy focused ROM than stock android - I got one for a friend who’s never used any other custom ROM before and he loves it.

This video of optimising the layout of libreoffice should be helpful;

https://youtu.be/x44bda1dz84

All of these recommendations are based on android/fdroid:

Bodyweight Diary: Trale https://f-droid.org/en/packages/de.quantumphysique.trale/

Workout Log: GymRoutines https://f-droid.org/packages/com.noahjutz.gymroutines/

Calorie Counter: Energize https://f-droid.org/packages/com.flasskamp.energize/

Breathing Techniques Breathly https://f-droid.org/en/packages/com.mmazzarolo.breathly/

use anki instead if your looking for an alternative