Nearly half of 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 of an adrenalin rush than that offered by whitewater rafting, 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 ones own. Some of the rapids are too big to be done on a river board, however, and for these rapids one has to climb into the raft. Expect to sign forms explaining that the tour operator is not responsible for any injury or death that may result of this activity, but note that the vast majority of river boarders escape unscathed!