Street Luge
This is a dangerous game that involves many casuals than any other sport in this list. It is for this reason that the game takes so much caution and only takes place in a certified ground which undergo safety inspections.
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The game relies heavily on gravity which takes to speeds of up to 164km/h with the player attaining the highest speed being declared the winner. The game was invented in southern California by the natives. Its first professional race was held in 1975 at Signal Hill, California.