A leisurely stroll does some good, but the study showed that a brisk pace of three m.p.h. or more is the key, even more important than how far you walk.

• 悠闲散步的确也不错，但是研究表明，每小时3英里或3英里以上的轻快步伐是很必要的，这甚至比你走多远更重要。