Breathing gets conditioned by how we live our lives – energy can be mottled and unbalanced. It is a signifier of the heart. We can take time during retreat to take samādhi as a way of life, unifying body, heart and mind to bring into fruition the factors of awakening.
Exploration of mindfulness of the body. The Buddha's First Foundation of satipatthana offers many opportunities for insight. As the Buddha said, if we master the body (in meditation) we can master the mind!