This article deploys Peircean approach to bodily skills, foregrounding motricity as a semiotically mediated and a “suprasubjective” process. By examining two contrasting skills – javelin and martial arts – I draw out the relevance of dynamic movement to the semiotics of sport and embodiment. These contrasting movements expose different epistemological assumptions since they emerge in distinct cultural traditions. To attend to the cultural dimension of movement practices – including the mediation of signs making certain movement forms seem reasonable or desirable (...) in the first place – I highlight ecological dimensions of each somatic tradition. This ecological focus aligns with Peirce’s project of tracking how semiotic signs are positioned and mediated. To make ecological factors of motricity more recognizable, I contrast somatic engagements that take place on synthetic, predictable substrates and somatic engagements that take place on variable, unpredictable ground. In a similar way to the classic gestalt figure-ground relations, where perception of a figure depends on the particulars of the ground, I suggest that the ground upon which somatic action occurs shapes the way we make sense of it epistemologically. These different grounds – both literally and figuratively – operate representationally via thirdness: they lead us to conceptualize movement in culturally and historically particular ways. (shrink)