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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 on-body 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.