The skill in question is creeping across floorboards silently. (It's all about how you shift your weight as you move your feet, and that's something about which my tango teacher was a little bit obsessive.)
Being able to creep across floorboards silently is the skill of mine which (I dearly hope) has finally convinced my eldest offspring that it is totally not worth it to sneak onto social media or online games before the day's homework has been completed. Because it is hard to fully enjoy that social media or gaming when your stealthy parent might appear behind you without warning. Which means maybe doing the homework first, efficiently, could allow one to enjoy being online without fear of detection and consequences.
In a perfect world, you'd think logic would be persuasive enough. Since the world isn't perfect, I've made my peace with being a stealthy mother.