This article discusses how prolonged participation and digital composition online intersect to forge material extensions of the physical body, or limbs beyond the skin. Based on postmodern theories of technology and the body, I argue that these limbs, while less tangible, merit serious consideration given their potential to engender physical reactions to virtual events. The data used to illustrate this forging of limbs comes from a study of student engagement with online role-play, in which fictional role-play events had physical consequences for real-world participants. Exploring the body as networked across online and offline contexts provides a deeper understanding not only of youth engagement in the process of digital media composition but also in the design of curriculum that involves virtual settings for learning.