the sport of descending a steep road or track on a large type of skateboard on which riders lie on their backs, descending feet first

the sport of racing over rough ground on special motorcycles

the activity or sport of moving on skis at speed

a sport in which you sail across water by standing on a board and holding onto a large sail

the activity or sport of swimming as deep as you can under water without using breathing equipment

the sport of jumping out of an aircraft with a special parachute that allows you to travel a long horizontal distance before you land

the sport of climbing on rocks or in mountains

the activity of being moved quickly in a raft (= small boat filled with air) along rivers where the current is very strong