What does it mean to be in the moment? In yoga practice it's about doing what you're doing while you're doing it...and noticing anything that gets in the way of your presence: stray thoughts, criticism, overthinking, anxiety, resistance, you get the idea.
This backhanding practice will keep you in your body and in the moment by helping you focus, face those "extras", and feel what's going on right now...and chances are, you'll get up off that mat feeling taller, lighter, and in a better mood.
Enjoy!