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　　Old drought the butterfly stroke of 4 bid farewell

　　The bosom is alar pressure, ancon needle leaves, receive an abdomen to carry buttock, join water iron rule. Side presses thrash, hair force is swept inside, tiger back rises, place after play an arm. Hunch swing wrist, leisurely Yi Shuangyi, take put down gently gently, ancon ace is low. The leg since the leg falls, come from lumbar backbone, shape of anguine condition wave, first are a banner.

Behavioral structure and technology want a place

(１ ) back swim begin, both hands enters water in shoulder breadth position, double sufficient 蹠 is bent, preparation begins next make moving, the head a little pitch. The momentum that 　 of 　 of double arm place generates when turn around and stretch out one's hand, make both hands sinks, increase muscle power, those who make the arm makes oblique line outside delimit. Double leg issues dozen of movement to begin. (2) kick a leg to finish, thrash continues. The counterforce that kicks below the leg causes hip to carry face of litre of prevent floods by water control. The head begins to go up carry. (3) double arm delimits downward backward, achieve the biggest width, ancon joint drive up. Double leg finishs first time to make water motion. (4) both hands passes the body lower part, be close to a contact 90 degrees. (5) pass humeral arm lower part when the hand, elbow begins to be close to the body. Double leg begins to hit water. Swim member cervical begin inflectional, the head is small heavy Yu Shuizhong. (6) double arm is carried from surface, begin action of turn around and stretch out one's hand. Catch on double leg, knee joint unbend, the head is low, make movement of turn around and stretch out one's hand more light. (7) both hands brandish crosses humeral arm, pronation square, ancon joint is complete extend. Double sufficient begin 蹠 to bend. (8) both hands sinks in water, ham makes next make moving at the same time. Knee joint is inflectional increase. Double sufficient adjacent show water. (9) the first phase when thrash, move to be close to below the leg finish. Swim member shut gas circularly afore, gash in the arm only then while, make expiratory the 　 that move 　 is made. The whirl of the upper arm creates the position of tall ancon.