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Master Black Belt
I think one defining aspect could be the free movement of ones body (combat sports, gymnastics, running); and/or the manipulation of a free-moving object (by "free moving," an example would be free weights as opposed to machines). This free moving object could be pool stick or a basketball. But it would rule out video games, since the video game controllers consist of parts whose movements are "fixed," nor does using the controller result in the free movement of any physical object. Should pinball be considered a sport then? I'd be open to it.