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We all know that exercise is important – vital, in fact. Yet, one of the most common excuses for not exercising enough is “I can’t find time for exercise.”我们都知道运动很重要——其实是非常重要。可是英语自学课程免费新概念英语自学辅导，最常见的不运动的一大借口就是“我抽不出时间做运动”。

And it’s true. It is hard to find time for exercise. Just like it’s hard to find time to meditate, cook healthy meals, and volunteer to make your community a better place.而事实也的确如此。人们很难挤出时间做运动，就像我们挤不出时间去冥想、烹饪健康食物、做社区志愿者一样。

The American College of Sports Medicine (ACSM) and the American Heart Association (AHA) provides the following minimum exercise guidelines for healthy adults (18-65):美国运动医学学院（ACSM）和美国心脏协会（AHA）为成年人（18-65岁）的健康制定了以下最少的运动指南：

Moderate-intensity aerobic physical activity for a minimum of 30 minutes, five days per week (e.g. a brisk walk) or;每周五天、每天至少30分钟的中等强度有氧运动（例如快走）；

Vigorous-intensity aerobic physical activity for 20 minutes, three days per week (e.g. jogging) or;每周三天、每天20分钟的高强度有氧运动（例如慢跑）；S

ome combination of moderate-intensity and vigorous-intensity.中等强度运动和高强度运动相结合。