Rafting

Rafting is an outdoor sport in which a person uses an inflatable raft to navigate a river or other body of water. This is often done on rough water. This usually requires teamwork. Rafting is a dangerous sport. People can die while rafting. Rafting is also a competitive sport. 
History.
Rafting goes back to 1811 when the first attempt to go on the Snake River was planned. With no training, the river was too difficult and dangerous.
Classes of water.
The International Scale of River Difficulty use six grades of difficulty to describe rivers for white water rafting. The scale ranges from simple to very dangerous and potential death or serious injuries.