Waste it, it's free

Day 23
Today while doing a little yoga, I was trying to "send" air to different parts of my body, as per my Youtube instructor's urgings.  Send air to your lower back, to your upper rib cage, down your right side, out your fingertips, etc.  And today in my classes, I led my students in a bunch of warm ups where they "launched" imaginary arrows, darts, paper airplanes, and various other projectiles using their air.  And yet, my air often feels like it gets stuck.  Like I have to picture it in some other metaphorical way to get it to where I want it to be.
Same thing in my practice tonight.  Send the air out my bell and around my head back to my left ear, as my teacher used to say.  It helps, as do all of these biofeedback techniques.  But why?  Where does the air "go" when we send it?  And why doesn't it go there to begin with?
Just some Thursday night musings as I oxygenate my blood...