An Analysis Of Rotations Body Difficulty Of Rhythmic Gymnastic Individual Ball Under 2017 Code Of Points

The code of points for international rhythmic gymnastics guide the development of the project.The 2017-2020 cycle scoring rule cancels the rule that the difficulty score is 10 points,does not set the upper limit,emphasizes the combination of equipment technology and body movements,and encourages the creation of diversified movements."Difficult","beautiful","stable" and "new" are the development direction of rhythmic gymnastics.By using the methods of literature,questionnaire,video analysis and mathematical statistics,this paper analyzes the rotation body difficulty movements and ball exercise equipment difficulty movements in 2009-2012,2013-2016 and 2017-2020 in the international scoring rules of rhythmic gymnastics,and also analyzes 2018(38th)and 2019(39th)This paper analyzes the top 8 complete sets of individual ball games in the world championship of rhythmic gymnastics and the 5 complete sets of individual ball games in which Chinese individual athletes participate in the world championship,in order to find out the shortcomings of Chinese athletes in the body difficulty of rotation,and to provide theoretical support for improving the competitive ability of rhythmic gymnasts and the development of Rhythmic Gymnastics in China.The conclusions are as follows:1.The scoring rule of 2017-2020 cycle is changed to: the minimum number of body difficulty actions is required to be 3,the minimum number of body difficulty group is 1without upper limit,and the score is 9 body difficulty actions with the highest score;the regulation that the upper limit of difficulty(d)is 10 is canceled,and the upper limit of difficulty score is not set.With the continuous refinement of the types of rotation body difficulty movements,the distribution of rotation body difficulty movement scores in the rhythmic gymnastics scoring rules has been relatively balanced.The rules encourage athletes to use new body difficulty movements,increase the arrangement of high score rotation body difficulty movements in the whole set of movements,and advocate diversified rotation types.2.The new cycle rule improves the requirements for the value and completion quality of difficult actions,and increases the competitiveness and appreciation of the whole set ofactions.If there is no upper limit for difficulty score,the capacity and quantity of difficult actions will increase.3.The top 8 athletes of the two World Championships usually use the helpful back leg moving,the helpful back loop turning and the balance turning of foot bending.Chinese athletes use the rotation type of body difficulty movement scores are low,rotation type is relatively single,rotation cycle number is less,lack of high basic score rotation.The completion quality of Chinese athletes' rotation body difficult movements still needs to be improved.There are some problems such as low heel raising,insufficient opening of free leg,poor stability,and movement when landing.4.It is the trend of the development of rhythmic gymnastics to pay equal attention to the balanced development of equipment technology and body difficulty movement,but the combination of equipment technology and body difficulty movement of Chinese rhythmic gymnasts is weak,and the connection mode of personal ball exercise equipment technology and rotating body difficulty movement is relatively single.