How are we to care for our bodies and our health as part of faithful Christian living? Melanie Dobson excavates from Thomas Aquinas an answer for how contemporary Christians might live well in the midst of a very sick culture. Through a close reading of Aquinas's 'Treatise on Habit', Dobson reveals that the moral practice of habit does indeed include health. Thomas's keen understanding of the human person and of human longings supports the book's argument for a practice of health that directs us deep into the heart of God. Field research with clergy and missionaries offers concrete examples of the implementation of habits of health as part of the life of Christian virtue. The stories from the Clergy Health Initiative and Word Made Flesh missionary organization exhibit transformations that ushered Christian leaders into deeper love of God, neighbor, and themselves. In the end, the theology of habits of health means that our quotidian care of our bodies is not only faithful, but directs us into a life of flourishing.