Kragh outlines the practice as follows:it is instructed that the practitioner should hold the breath below the navel to make the A-letter flare up like a flame, the fire reaching so high that the flames strike the letter Ham visualized in the great-bliss-cakra. This causes an energy called bodhicitta ("byang sems"), which is stored in this cakra, to trickle down through the central channel. As it fills up the different cakras on its way down, it generates different experiences of bliss. After reaching and filling the navel-cakra, the bodhicitta is visualized as flowing back up, while yogi continues to use the "gtum mo" breathing technique of holding the breath for as long as possible in the abdomen. At the end of the practice, the practitioner stops visualizing ("yid la mi byed") the channels, winds, and drops, and instead rests in an uncontrived state of Mahamudra ("phyag rgya chen po ma bcos pa'i ngang"). Another meditation manual by Gampopa also mentions a practice that relies on visualizing a drop ("thig le, *bindu") between the eye brows. This bindu descends and ascends through the central channel, spreading a sensation of bliss-emptiness along the way. Regarding post-meditation, the yogi is "instructed to train in experiencing all sensory impressions as blissful and to maintain a constant sense of inner heat and the soothing, cooling bliss of the descending bodhicitta. It is said that the experience of everything as being blissful will automatically give rise to the experience of non-thought ("mi rtog pa, *nirvikalpa")."