Early in my teacher training we focused on metacognition: helping students acquire knowledge about their own cognitive processes. When students understood how they perceived and processed information, they could use this understanding to help themselves best learn.
I think of mindfulness as metacorpuscognition: understanding how our minds and bodies interact, how this interaction affects the way we perceive and process information, and how neuroplasticity allows us to reshape the physical structures involved in this interaction.
Or, in other words, breathing deeply 🙂