anything, you're just noticing what's already happening at this moment. It's an active engagement in your immediate experience, an alertness, a preparedness to openly accept whatever arises without judgement. This attentiveness includes what's going on" internally" - by which I mean: the general feelings observed, emotional states, thoughts that present themselves, particular narratives the mind reels off; mental phenomena in general - as well as what's going on "externally" - by which I mean: physical sensations via the five sense doors: touch, sight, sound, taste, and smell. Attentiveness only ever happens right now, not in the future and not in the past, now. Not then. Only now. To be attentive or mindful is to be actively present; to be cognizant of what is happening at this moment in time.