What do we mean by theory? How does one theorize? And how does our understanding of theorizing change when relying on practice theories. These are the key questions that I explore in a recently published book chapter. I revisit the current debates on theory in International Relations and cognate disciplines. I then discuss what it means to think about theorizing as a practice. I end in laying out different styles of how one can theorize when drawing on practice theories. The chapter will be interested for those who want to use practice theory, but also those who are interested to theorize. The chapter is available as open access here.