铅球投掷是一个技术性强,动作结构复杂的全身性活动的项目,它需要全身各部位的协调配合,使得人体在极短的时间内将身体各相关部位的力合理的施加于铅球上.在这其中,左腿动作(以右手投掷为例)起着决定滑步的方向、速度、重心和移动路线以及充分发挥它的效应等作用.滑步技术中常见的“跳步”和“滑步不连贯”等错误,很大程度上是由于左腿摆动不够正确造成的.因此对此问题有必要进行分析探讨. Shot putting is a technical and complex movement of the body structure of the project, which requires the coordination of all parts of the body, making the body in a very short period of time the body’s relevant parts of the force applied to the shot put in. Among them, the left leg action (throwing the right hand as an example) plays the role of determining the direction, speed, center of gravity and movement route of the slide step, and giving full play to its effect, etc. The common “jump” and “ Slipped inconsistent ”and other errors, largely due to the left leg is not properly caused by the swing, so it is necessary to analyze this issue.