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Sport is caused and controlled by muscle forces． Sport movement is possible because of an arrangement of the body´s skeletal framework into segments and movements are really combinations of basic movements occurring in many body segments at once． To understand the body´s ability to play sport requires the study of the structure and function of muscles，bones and joints． The amount of movements possible at a joint，the length and elasticity of the ligaments and tendons at the joint，and the type of muscle initiating the movement all influence the rate and range of possible movement． ［1］ This lesson is designed to help students understanding of the muscle actions，the types of muscle movement and basic mechanical concepts related to sports．
运动是由肌肉力量控制和产生的。一个体育动作是由组成身体骨架的若干环节同时移动而产生的。为了进一步理解身体的运动能力，需要研究肌肉结构、肌肉功能、骨骼和关节。影响完成动作范围大小和速率的因素有：某一关节可以完成的动作量，关节处韧带和肌腱的长度和韧性以及肌肉种类。本课意在帮助学生理解肌肉的动作、肌肉运动的种类以及与体育相关的基本力学概念。
