The Church for the Doubting Thomas is a sanctuary for people who grapple with their faith in Christianity and the existence of God. Located in Piazza di Sant’ Eustachio in Rome, it functions as a temporary home for participants of a transformative month-long programme. As a lifelong Catholic, reconciling religious beliefs with the discoveries of modern science presents constant challenges. While religion occupies an uncertain space, exercise provides stability. This project was conceived from a passion for weightlifting and almost religious trips to the gym. In contemplating the parallels between spirituality and the body, exercise entered the drawing process. The constraints that the project devised for drawing through exercising became a methodology that was both surprising and fun. The design drawings took on a more bodily character and the architecture, which referenced elements from traditional Roman churches, became more unconventional. This design language that evolved was appropriate to the idea of a church for doubters, as in a sense, the architecture itself became the doubter.