Conscious breathing:

Breathing is life!  There is intimate connection between breathing and state of mind. Acccording to Hatha Yoga Pradipika " when the breath wanders, the mind wanders and the mind gets unsteady but when the breath is still, so is the mind still." Pranayama means “to control the breath”, or “mastering the life force”.  Even studies at Stanford showed that slow breathing induces tranquility