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Generally speaking, a physically fit person's organic systems are healthy.
通常，身体健康的人会拥有健康的器官系统。
They can function efficiently to resist diseases, to enable the fit person to join in various tasks and activities, and to deal with emergent situations.
它们可以有效地发挥功能抵御疾病，让健康的机体可以执行各种任务及活动，并能应付突发情况。
Physically fitness involves various factors. To be a fit person, you should, first of all, improve your heart, lung and blood vessel function.
身体健康包含很多因素。想要身体健康，你首先要改善自己的心、肺、血管功能。
Cardiorespiratory endurance is the fundation for whole body fitness.
心肺耐力是全身健康的基础。
Muscular strength is essential for your body to do work.
肌肉力量对于身体执行工作而言必不可少。
Muscular strength can be improved by training activities.
肌肉力量可以通过训练活动得以提升。
Muscular endurance has something to do with strength.
肌肉耐力与力量有关。
Naturally, energy is needed when muscles contract.
肌肉收缩自然需要能量。
Energy production requires that oxygen and nutrients be delivered by the circulatory system to the muscles.
要产生能量需要人体的循环系统将氧气和营养物质输送到肌肉。
Flexibility is the ability of joints to move.
关节灵活性是指其转动的能力。
Flexibility can be highly developed and maintained by regular stretching.
经常做一些拉伸运动可以大大提高并保持关节的灵活性。
The last feature of fitness is body composition.
健康身体的最后一个特征是身体成分。
It is the makeup of the body in terms of muscle, bone, fat and other elements.
它是就身体中的肌肉、骨头、脂肪及其他组成成分而言的。
It is important to control the percentages of body fat and fat-free weight.
对人体内脂肪重量及去脂体重进行控制很重要。
Health experts notice that a large number of people are overweight and obese.
健康专家注意到很多人都超重、过度肥胖。
Therefore, fat people should do more exercises to help reduce body fat.
因此，胖人应当多做锻炼减少体内脂肪。
译文属可可原创，仅供学习和交流使用，未经允许不得转载
