Many people hurt themselves when they have been inactive and then suddenly take on a major exercise program, such as training for a half-marathon.

平时不怎么动弹之后又突然进行剧烈的活动项目比如半程马拉松，许多人都是这样对自己的身体造成了伤害。

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Spang said many people hurt themselves when they have been inactive and then suddenly take on a major exercise program, such as training for a half-marathon.

斯潘说许多人受伤是因为平时不怎么动弹之后又突然进行剧烈的活动项目比如半程马拉松。

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The named program must be inactive.

指定的程序必须处于非活跃状态。

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Health experts advise people who have been physically inactive to have a complete physical exam before beginning a new exercise program.

VOA: special.2011.06.28