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Unit 118：Mix'em up
第118单元：混合做多种运动
People enjoy exercising more when they engage in more than one activity,says Dr.Brownell.
布洛耐尔博上说:“人们做的运动不只一项时会比较喜欢运动。”
A variety of exercises gives your body a better all-around workout and stretches your easily bored mind.
各式各样的运动使你更能全身活动，也可以让你不那么容易感到无聊。
Sometimes a simple stretch is all you need.At other times,you want to go for the burn in an aerobics dance class.
有时候你需要的只是伸伸懒腰，有时候你会想到有氧舞蹈教室去燃烧脂肪。
Another day you may decide to lift weights or go for a long bike ride.
改天说不定你会决定去举重或骑脚踏车呢。
