Flow refers to a special experience of total absorption in one task. Sustained flow (also known as directed motivational currents) is the occurrence of flow in a series of tasks aimed at achieving a certain outcome (for example improving proficiency in a second language). In this article, we investigate "shared, sustained flow"--which occurs when a group of individuals working collaboratively experience sustained flow. Interviews were conducted with five participants (two teachers and three students) to find out the conditions perceived to have facilitated this experience during pre-sessional language courses at two British universities. The results point to three main conditions: forming a group identity, attaching personal value and providing partial autonomy. We discuss how teachers can apply these findings to design motivational out-of-class activities.