Olympic fans, prepare to watch hookers in a scrum who hope not to end up in the sin bin.The lexicon of rugby, and the men's game itself, return to Olympic competition after a 92-year absence. The return in Rio also involves a couple of debuts: It's the first Olympic appearance for women in the sport, and a first for Rugby Sevens. It's a seven-on-seven game. Traditional rugby has 13 or 15 a side.Sevens is a fast, physical and unpredictable game. Rugby organizers hope an Olympic showing will spread the game's popularity beyond traditional hotbeds like New Zealand, Australia, South Africa and the U.K.For those who didn't grow up in those countries, rugby knowledge is limited.Americans might be able to conjure up images similar to football. In rugby, teams move a watermelon-shaped ball toward a goal line, or the try line.Players move the ball by running with it or passing, although there's no forward passing. Players can also advance the ball by kicking it. And there's tackling, a lot of
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