- Rugby is growing in the U.S. with almost 120,000 registered players
- Game was first played in U.S. in 1870s
- U.S.A is 'defending' Olympic rugby champion
- Rugby returns to Games for first time since 1924 -- when U.S.A won
(CNN)It's the fastest growing team sport in the country, pulling in players from American Football, and the U.S. national side aims to be ranked within the top five in the world in five years.