It helps balance your muscle groups.

它能帮助平衡肌群。

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You will use more muscle groups on an incline, which will burn more calories.

如此在上面跑时用的肌肉更多一些，可以烧更多的卡路里。

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In general, warm up by focusing first on large muscle groups, such as your hamstrings.

通常，热身首先注重在在大的肌肉群，例如你的大腿。

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Muscle-strengthening activities help build and strengthen muscle groups in the body.

VOA: special.2011.06.28

Nearly all of the major muscle groups are put to work.

VOA: special.2010.06.08

Aerobic activity is a repetitive rhythmic exercise involving large muscle groups such as legs, shoulders and arms.

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The Occupational Safety and Health Administration recommends mixing noncomputer-related tasks into the workday, so that you're moving and using different muscle groups.

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One routine targets all muscle groups by lifting heavy weights through movements like squats, bench presses, bicep curls, tricep extensions, calf lifts and lateral pull-downs.

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