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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，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）； Some combination of moderate-intensity and vigorous-intensity. | 
