Secondary school teachers have complex, intensive and dynamic routines in their classrooms, which makes their attentional resources limited for human-computer interaction. Leveraging principles of peripheral interaction can reduce attention demanded by technologies and interactions could blend more seamlessly into the everyday routine. We present the design and deployment of FeetForward - an open-ended, and foot-based peripheral interface to facilitate teachers’ use of interactive whiteboards. FeetForward was used as a technology probe to explore the design of new classroom technologies which are to become peripheral and routine. The deployment took place with three teachers in their classrooms for five weeks. Based on in-depth and longitudinal interviews with the teachers, we discuss about how FeetForward integrated into teachers’ routines, what its effects were on teaching and whether its foot-based interaction style was suitable for peripheral interaction. Subsequently, implications on design of peripheral classroom technologies were generalized.