In any activity that requires concentrated effort, the breath quite naturally plays a role. If you have ever tried to thread a needle or repair a watch, you might have observed that without even thinking about it the breath quiets and deepens. Singers, swimmers, people who struggle with panic attacks, and a host of others learn the importance of proper breathing in order to negotiate the respective tasks at hand. Thus, that the art of contemplative practice can be facilitated by the breath should come as no surprise.
It's a curious paradox in this life that change is a constant, dependable, and unchanging fact. But when we try to control the moment by denying what is so, we have lost the moment to the past or the future. Trying to alter the moment steals it from us. If we want fruitful change in our lives, we have to move through each moment, experiencing its wholeness, savoring what it has to offer, noticing where we are stuck, and in the process maintain an intimate contact with our deepest sense of self.