Hold up imaginary sunglasses and breathe on them as though to clean them. Feel the back of the throat constricting a little, then keep that gentle gathering there as you now close your mouth and breathe in and out through the nose, feeling the breath at the back of the throat. Hear the ocean sound the breath makes along the whole length of the inhalation and the exhalation. Ujjayi is like a steady, gentle but potent steam valve that will power your movement. Ujjayi is your dear friend there always in your practice, until it subsides into the natural breath during relaxation and meditation.