在平时立定跳远学习中经常会看到以下三种情况:一是学生在跳之前摆臂,但在要跳的时候手臂却不摆动了;二是学生手臂在向后摆的时候人跳出去了;三是多次或反复摆臂,但在跳出去之前,摆臂动作突然出现节奏的变化。这三种摆臂情况很明显不能对跳远的成绩起到积极作用。第一种情况摆臂没有起到任何作用,做的是无用功;第二种摆臂情况对整个动作结构起到破坏的作用,人在向前跳,手臂在向后摆,不符合运动规律;第三种摆臂使 In the usual set long jump learning often see the following three situations: First, the students swing arm before jumping, but the arm does not swing when you want to jump; the second is the student arm in the backward swing when people jump out ; Third is repeated or repeated arm, but before jumping out, the action of the arm suddenly changes in rhythm. Obviously these three kinds of swing arm can not play a positive role in the performance of long jump. The first situation does not play any role swing arm, doing is useless work; the second swing arm situation on the entire action structure has played a sabotage role, people jump forward, arm swing back, does not meet the law of movement; The third swing arm to make