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Generally speaking, a physically fit person's organic systems are healthy.
通常，身體健康的人會擁有健康的器官系統。
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.
它們可以有效地發揮功能抵御疾病，讓健康的機體可以執行各種任務及活動，并能應付突發情況。
Physically fitness involves various factors. To be a fit person, you should, first of all, improve your heart, lung and blood vessel function.
身體健康包含很多因素。想要身體健康，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礎。
Muscular strength is essential for your body to do work.
肌肉力量對于身體執行工作而言必不可少。
Muscular strength can be improved by training activities.
肌肉力量可以通過訓練活動得以提升。
Muscular endurance has something to do with strength.
肌肉耐力與力量有關。
Naturally, energy is needed when muscles contract.
肌肉收縮自然需要能量。
Energy production requires that oxygen and nutrients be delivered by the circulatory system to the muscles.
要產生能量需要人體的循環系統將氧氣和營養物質輸送到肌肉。
Flexibility is the ability of joints to move.
關節靈活性是指其轉動的能力。
Flexibility can be highly developed and maintained by regular stretching.
經常做一些拉伸運動可以大大提高并保持關節的靈活性。
The last feature of fitness is body composition.
健康身體的最后一個特征是身體成分。
It is the makeup of the body in terms of muscle, bone, fat and other elements.
它是就身體中的肌肉、骨頭、脂肪及其他組成成分而言的。
It is important to control the percentages of body fat and fat-free weight.
對人體內脂肪重量及去脂體重進行控制很重要。
Health experts notice that a large number of people are overweight and obese.
健康專家注意到很多人都超重、過度肥胖。
Therefore, fat people should do more exercises to help reduce body fat.
因此，胖人應當多做鍛煉減少體內脂肪。
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