What makes a sport a sport? Is a hot dog eating contest a sport? What about foosball, hunting, bobsled, bowling, or breakdancing? In Why Baseball Is a Sport and Golf Is Not: Separating the Players from the Poseurs, Aaron S. Bayley and Luigi Di Serio argue that an activity isn't a sport just because society says it is: it first must meet a definitive set of criteria. The results aren't always what you'd expect.