二者并不是一回事，却无疑是相互联系、互为补充的。
They are not the same thing. But they are necessarily linked, and complementary.
问题之一是，人们通常将“锻炼”和“体力活动”混为一谈，而二者并不是一回事。
One problem is that people often confuse "exercise" and "physical activity." They are not the same thing.
二者之间的相互关系并不完全清楚。
The interrelationship between them are not completely clear.
二者之间有相互促进的地方，但并不如人们所普遍认为的那样天然统一。
Although they can promote each other, they are not naturally concordant as people always think.
二者之间有相互促进的地方，但并不如人们所普遍认为的那样天然统一。
Although they can promote each other, they are not naturally concordant as people always think.
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