Cardiorespiratory fitness, or aerobic fitness, is the ability of the circulatory and respiratory systems to deliver oxygen to skeletal muscles during sustained physical activity or exercise.

心肺适能，或有氧适能，是指持续体力活动或锻炼时机体循环系统和呼吸系统向骨骼肌供氧的能力。

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This may mean taking an aerobic class for two minutes or walking for an hour, depending on your level of fitness.

这里所指的也许是上个两分钟的有氧运动课，或是走一小时的路，完全看你自己的健康状况而定。

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I'm working on the fitness side now, doing aerobic exercises, and this is very useful because last season I played only four or five games.

我现在正在进行体能方面的训练，做一些有氧运动，这非常有用，因为上个赛季我只打了四五场比赛。

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