A movement
(1) Exercise: It is a set of rules involving physical strength and skills, and it is also a behavioral activity constrained by habits, which is usually competitive. There is no object that does not move, and there is no movement that can leave the object. Movement is conservative, that is, it can neither be created nor destroyed, but its concrete forms are diverse and can be transformed into each other, and the total amount of movement remains unchanged during the transformation.
(2) In geometry, the motion of a rigid body is described as the mapping from a plane to itself, and the distance between any two points A and B is the same as the distance between their images A' = m (a) and B' = m (b). In philosophy, motion is defined as the linear migration of things in time and space. Part of speech: the coordinate structure only refers to the same concept.
Second, the role of sports.
(1) An activity involving physical strength and skill, bound by a set of rules or habits and usually competitive. The other is a social activity with physical exercise as the basic means, combined with natural factors such as sunshine, air and water and health care measures, to achieve the purpose of strengthening physical fitness, improving health and enriching social, cultural and recreational life.
(2) Physical education plays an important role in promoting normal physical development, improving mental health, enhancing social adaptability and cultivating all-round talents. Second, it refers to the educational activities that guide students to learn and master the basic knowledge and skills of physical education in the school education environment, so as to form their awareness of physical exercise, improve their physical activity ability and promote health.