Would be cool to see some sort of difficulty/strength setting as I'm definitely not able to do handstand push ups to train my shoulders. ;)

Yes. Planning to add difficulty levels and progression-friendly alternatives (e.g. pike push-ups, dumbbell presses, etc.) so you can train the same muscle group at your current level with the same button as you can see "Shuffle".

I can imagine some "Decrease difficulty" button. (or inverse).

Appreciate the feedback