Vinyasa yoga is all about consciously linking breath with movement. Practicing breath work, like Ujjayi Pranayama, or Victorious Breath, not only brings more focus to the breath, it also calms the nervous system. Victorious Breath in particular builds and maintains internal heat and energy as well. It is an audible form of breath work.
Rather than keeping the breath constricted in the upper chest like we often do, allow the lungs to fully expand and draw in the belly as well as the ribcage. Breathe only through the nose and slightly constrict the back of the throat to make an aspirant sound on the exhale as if you are fogging up a mirror. Keep this constriction in the throat so that your inhale is also audible. Now balance the length of the inhales and exhales. Maintain Victorious Breath as you move through yoga postures – being sure to time your movements in tune with the breath – neither rushing, nor lingering unnecessarily in a posture. Check out the Sun Salutation A diagram and practice flowing through a couple using Ujjayi Pranayama as your metronome.
Common Sense Disclaimer: You should only feel steadiness and ease with this breath – not discomfort or light-headedness. If you experience strain, stop and breathe normally. Always allow your body to be your guide in your yoga practice. There is no end goal, just aware and continuing practice.