Strength refers to the explosive force of a certain part of the body muscle; Flexibility refers to the range of motion of human joints and the elasticity and stretching ability of ligaments, tendons and muscles. Endurance refers to the ability of the human body to overcome fatigue when working or exercising for a long time. Because the three are interrelated, any kind of functional decline will affect the overall physical quality, so we should pay special attention to the combination of the three when exercising.
! Relationship between physique and health: both physique and health are related to human body's morphological development, physiological function, sports ability, psychological state and adaptability to society (including interpersonal relationship), which shows that there are differences and connections between them. Physical fitness is the most basic element of life activities and the material basis of health. From the research point of view, physique focuses on physique, body shape, physical quality, sports ability and so on. And health focuses on the study of diseases, abnormalities and deaths of the tissue structure and physiological functions of the heart, liver, spleen, lung, kidney and blood vessels. Physique studies the human body from the "appearance", while health studies the human body from the "inner". Physical fitness is the quality of human body, while health is the reaction and performance of physical fitness. Therefore, when evaluating physical health, some indicators are difficult to be regarded as pure physical indicators, and some indicators are difficult to be regarded as pure physical examination indicators.
A person's body is always in the process of continuous development. Birth, old age, illness and death are the inevitable laws of life, and no one can stop them. For people of all ages, the implementation of "health investment" and "health savings" is the most active and effective way to enhance physical fitness, delay aging, promote health, obtain high-quality work and life quality, and achieve longevity. There are three most important points to insist on physical exercise: ① from an early age, ensure one hour of physical activity every day; (2) lay a solid foundation, cultivate lifelong sports habits and implement the outline of the national health plan; ③ Sports workers should improve teaching methods and strengthen physical exercise. In teaching, it is necessary to understand students' physical condition, formulate targeted and scientific physical education teaching plans, guide physical education teaching, carry out sports activities, and continuously improve students' physical education quality.