[以暑假假期为主题的英语作文]暑假一转眼就过去了，我这个假期我过的很有意义，因为妈妈带我去旅游.爷爷奶奶从外地来看我.我遇到过开心的事，也有不开心的事，因为我学会了很多东西.以前我不会洗衣服，但是我现在...+阅读
Foreign researchers state that the best time for exercises is 8-12 in the morning and 14-17 in the afternoon. During these period the speed, strength and endurance of muscle is relative stable in comparison to the fast changing physical status in a whole 24 hours day. Exercise should be appropriate no matter when you do it. And you are never too old to do the exercise. The body-wide movement such as swimming, jogging and walking is more suitable for taking exercises, especially to the elders. One more attention is that never doing any exercises after dinner. 国外研究者指出，锻炼身体的最佳时间是8月12日在上午和下午14-17。在这期间，速度，力量和肌肉耐力是相对比较稳定，在一个瞬息万变的全日24小时的物理状态。运动要适度无论你什么时候做。你是活到老，做这项工作。如游泳，慢跑和散步全身性运动更适合锻炼身体，尤其是对长辈。还有一个值得注意的是，晚饭后不做任何练习。
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