Pursed-lip exhaling

Start by lying in Deep Relaxation pose (Savasana). 

When you are comfortable, purse your lips so that there is only a tiny opening for your exhalation.

Pursing your lips during the exhalation will engage the abdominals, causing a stronger exhalation than if you don’t use these muscles. 

Can you feel the abdominal muscles help to squeeze the air out? 

On your subsequent inhalation, you should be able to feel air being drawn down effortlessly into the bottom portion of your lungs. 

Barbara says that the ideal position for this exercise is sitting, but begin by lying down and practice that way until you are completely comfortable sitting up.