luge
Speed sport that consists of racing down an icy track on a singles or doubles luge; luge racers lie on their backs with their feet forward and reach speeds of 90 mph.
doubles luge 
Luge designed for two racers; the luge racer on top (the heavier of the two to improve aerodynamics) is held in place by a strap.
singles luge 
Luge designed for a single racer; it is shorter and lighter that the doubles luge.
runner 
Piece or wood or fiberglass that is attached to the bottom of the sled; the luge racer steers by applying foot pressure to the front of the runners.
edge 
Sharp part that forms the edge of the blade; the blade is a metal piece placed under the runner so that the luge can slide over the ice.