Doctors recommend exercising a few times a week, doing both aerobic activity and strength training.

医师建议每周运动数次，包括有氧运动和肌力训练。

For those who have difficulty walking, other research shows that any form of aerobic activity provides health benefits, he added.

他补充说，" 其他研究显示，对那些行走不便的人来说，任何形式的有氧运动都有益于健康。"

Walking is another great aerobic activity to help you increase your blood circulation.

步行是另一种很好的有氧运动，可以帮助您增加血液循环。

Getting 10 to 149 minutes a week of aerobic physical activity was associated with a 21% decreased risk of flu and pneumonia death, the study showed.

研究显示，每周进行 10 到 149 分钟的有氧运动可以将死于流感和肺炎的风险降低 21%。

Currently, the U.S. Centers for Disease Control recommends Americans spend two and a half hours every week taking part in an aerobic activity, like a fast-paced walk.

目前，美国疾病控制中心建议美国人每周花两个半小时参加有氧运动，比如快节奏散步。

This , in fact, would result in the heart having to work harder to pump blood to the muscles, especially if we're doing aerobic activity like cycling or running.

事实上，这将导致心脏不得不更努力地将血液泵入肌肉，特别是当我们在做有氧运动时，比如骑自行车或跑步。

Aim for at least 150 minutes of moderate-intensity aerobic activity or 75 minutes of vigorous-intensity aerobic activity each week, along with muscle-strengthening activities on two or more days a week.

目标是每周至少进行 150 分钟的中等强度有氧运动或 75 分钟的高强度有氧运动，以及每周两天或更多天的肌肉强化活动。

Meeting both recommendations for aerobic and muscle-strengthening activity cut the risk associated with flu or pneumonia death nearly in half, but meeting just the aerobic activity target was associated with a 36% lower risk, according to the study.

研究显示，有氧和无氧运动均达标的人死于流感或肺炎的风险几乎减半，而仅是有氧运动达标的人这一风险降低了 36%。