In recent years, the use of inertial sensing for body motion recognition has been demonstrated. However, existing work generally focuses on upper-body movements, which involve smaller scale movements and are less rapid. In this paper, we present two distinctive types of demonstration that show how onbody wireless inertial sensing can be used to capture detail inertial information of the more rapidly moving lower-body segments (e.g. the foot). The first demonstration shows how useful coaching support information for a sprinting exercise are captured; the second demonstration shows how inertial information of the lower segments are used to support football computer game applications, through which the users may trigger the appropriate on-screen actions by their foot motion, instead of using the current hand-held inertial sensing controllers. Keywords-action triggering; football; inertial sensing; sprinting; wireless sensors.