In the search for happiness, we generally only experience the search, marked by discomfort or desperation. Relationship is key. The instructions for ānāpānasati train us to develop a more dispassionate relationship where we learn to stand in the presence of, or witness from, the edge of experience. From here the right kind of relationship, marked by non-expectation and non-aversion, can be cultivated.
The deeply ingrained reactivity to jump from unpleasant feeling is saṇkhāra. We leave the richness and intelligence of embodiment for the virtual world of programs and drives. Steadying and stabilizing the bodily energies with ānāpānasati develops a different kind of saṇkhāra, one that responds to phenomena with non-demand and acceptance.