田径运动是各项运动项目的基础,而速度又是田径的基础。决定百米跑成绩的因素固然是速度,而速度的快慢取决于步长和步频,只要能解决好步幅大和步频快,速度才能有所提高。中学生正处在青春期,也是从童年到成年的过度阶段,身体发育很快,变化也大,这是决定一生体质、智力等能否良好发育的一个 Athletics is the basis of all sports, and speed is the basis of track and field. Of course, the factors that determine the performance of a hundred meters of running speed, and the speed depends on the pace and pace, as long as you can solve the large pace and pace fast, the speed can be improved. Middle school students are in adolescence, but also from childhood to adulthood over the stage of rapid physical development, changes are also large, this is to determine the constitution of life, intelligence and other well-developed one