Movement-based interaction design is increasingly popular, with application domains ranging from dance, sport, gaming to physical rehabilitation. In a workshop at CHI 2016, a set of prominent artists, game designers, and interaction designers embarked on a research journey to explore what we came to refer to as "aesthetics in soma-based design". In this follow-up workshop, we would like to take the next step, shifting from discussing the philosophical underpinnings we draw upon to explain and substantiate our practice, to form our own interaction design theory and conceptualisations. We propose that soma-based design theory needs practical, pragmatic as well as analytical study - otherwise the felt dimension will be missing. We will consider how such tacit knowledge can be articulated, documented and shared. To ground the discussion firmly in the felt experience of our own practice, the workshop is organised as a joint practical design work session, supported by analytical study.