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Action sports, adventure sports or extreme sports are activities perceived as involving a high degree of risk. These activities often involve speed, height, a high level of physical exertion and highly specialized gear.
Extreme sports feature a combination of speed, height, danger and spectacular stunts.
6. Sports: a. Very dangerous or difficult: extreme rafting. b. Participating or tending to participate in a very dangerous or difficult sport: an extreme skier.
Denoting or relating to a sport performed in a hazardous environment and involving great physical risk, such as parachuting or white-water rafting.