Sit in Sukhasana, sitting on one foam block, making sure to place yourself correctly and drawing the buttocks out and back.
Resume breath awareness with a passive brain.
Inhale through both nostrils deeply but still relaxed.
Exhale making a humming sound like that of a buzzing insect.
DURATION: Repeat this 10 -20 times before changing the cross of the legs and repeating as for side one.
NOTE: The sound does not have to be a particular duration but should carry on the theme of relaxing to the end of the out breath. The in breaths may naturally assume more depth being influenced to do so by the extension of the out breath.
Connect the sound directly to your heart.
Do not be mechanical.