The 2nd Olympic Games began to label formal match project 1900. Backstroke includes to turn over breaststroke and backstroke climbing type. Turning over breaststroke is a kind of backstroke that appears the earliest, the action is similar breaststroke, and body pose is contrary. Namely human body lies on his back surface, two arms from the beginning hind the thrash after classics substance side direction. Original the backstroke match on a few Olympic Games is to use turn over breaststroke pose. 1912 on the 5th Olympic Games, american athlete H. He Baina uses the backstroke technology that two arms unload dozen of water on thrash, two legs by turns, with 1 ′ the achievement of 2 obtains 21 ″ champion of 100 meters of backstroke, showed the advantage of technology of backstroke climbing type, and turn over breaststroke to lose the sense in the contest gradually.
Of backstroke climbing type cooperate movement and crawl identical. Basic technology includes the action of body pose, leg and arm, and breath and movement cooperate to wait for a respect.
① body pose: The body when backstroke almost the level lies on his back in water, bosom nature extend and abdomen are become all the time line, the head does not have Yu Shuizhong, facial ministry shows water. When You Jin, the head maintains just pose from beginning to end, truncal around x-axis because of two arms by turns thrash movement and natural roll.
The technology of ② leg: The behavioral effect of the leg when backstroke has 3: It is to drive the body to advance, 2 it is to maintain body balance, 3 it is to maintain the body to have higher level pose. The range that the leg makes water is more largish than crawl. When hitting water, it is fulcrum with hip joint, ham sends force, drive crus and foot to go up forcibly kick. The knee joint when kicking water up is small bend, become left and right sides of 140 ° horn about, gambrel extend, the foot turns upcountry, the movement wants strong. When hitting water downward, unbend of knee joint nature, the fluctuation of two calcaneal is the biggest the distance makes an appointment with 40 ～ 50 centimeters. The tiptoe when kicking water comes back upcountry a bit, kick water area in order to increase.
