Research On The Effectiveness Of The Underwater Butterfly Leg Training Program

Underwater dolphin kick also known as underwater dolphin leg,that is,underwater dolphin kick.Use the underwater dolphin kick after each start and turn of the race.The underwater butterfly kick plays an important link between the start or turn of the stroke and the process of swimming,it has a great influence on improving speed and getting the best result?So,professionals also call the underwater dolphin kick the "fifth stroke."In terms of distance,according to the rules of FINA,the swimmer must be out of the water within 15 meters after the start and turn of the race,The various project of kick distance between the underwater dolphin kick and the whole course in various events can reach 30%,if it is a short course race,The various project of the underwater butterfly kick distance to the full distance can be as high as 60%.It shows that the dolphin kick has a decisive role in winning the freestyle race against the clock.In this article,after observing the training of education major students of Harbin sport university,the technical problems of underwater dolphin kick were found,This article puts forward the hypothesis,designs the reasonable underwater dolphin kick training plan,and obtains the training method which can improve the students' underwater dolphin kick technique after starting and turning.After 16 weeks of training,students' underwater dolphin kick movement techniques and performance were measured,statistically analyzed and compared by video observation,mathematical statistics and other methods.After 16 weeks of experiments,the students in the experimental group improved their underwater dolphin kick movements and ankle flexibility,and their underwater butterfly leg speed and freestyle performance of different distances were also significantly improved.The feasibility of the special underwater dolphin kick training program is proved.