Tại sao phải tập thể dục?
Cập nhật: 10:09 31/03/2012 GMT+7
(TNO) - Tập thể dục như đi bộ, chạy, bơi lội, đi xe đạp và đi bộ đường dài giúp cải thiện sức khỏe tim và phổi.
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