Keep your mid-back in contact with the floor.
Actively press everything from your mid-back and higher into the floor.
Can you press the back of your head into the floor? Your bra-line? Your upper back? The back of your wrists? Can you externally rotate (open) your shoulders and feel a stretch through your chest? Can you keep your neck, jaw and face relaxed? Can you feel the top of your shoulder blade move toward the floor as the tip of your shoulder blade moves into your body?
Press actively down for 30 seconds and repeat for 3 total rounds.