This practice is a kind of "pranayama," that generally involves sitting with a straight back, visualizing the channels, holding the breath deep in the abdomen for extended periods (called "vase breath", "kumbhaka"), then applying visualization of a fiery short stroke AH syllable on the navel. This practice leads the vitals winds into the central channel, where they are said to melt the drops ("bindus", which are tiny spheres of subtle energy) causing great bliss. This powerful bliss experience "is said to constitute a similitude of the actual bliss experienced in spiritual Awakening ("byang chub, *bodhi")."