Nearly half the rapids on the Zambezi River, below Victoria Falls, are classified as Grade 5 (Grade 6 is commercially unrunnable), which means that the steep gradient of the river causes long and extremely turbulent rapids with big drops and a high volume of water. For those that want even more adrenalin than the whitewater rafting can give, river boarding allows individuals to surf their way down the mighty Zambezi armed with only a body board, fins, a helmet and a lifejacket. The big attraction is the physical freedom and the sense of achievement felt after tackling the Zambezi on your own. Some of the rapids are too big to be done on a river board, however, and for these rapids you will climb into the raft. Expect to sign forms explaining that your tour operators are not responsible for any injury or death that may result of this activity, but note that the vast majority of river boarders escape unscathed!