These injuries are due to insufficient warming-up exercises, poor sporting proficiency, uneven field, reoccurrence of old injury and exhaustion.
造成运动损伤的主要原因是准备活动不充分、技术水平不高、场地欠佳、旧伤复发、运动疲劳等。
After warming-up exercises, the teacher told us the way of long jump and showed us how to do it.
经过热身运动之后，老师告诉我们跳远的方法，也向我们展示了如何做跳远运动。
The runners have been in their lanes. They are doing warming-up exercises.
赛跑选手们已经站到了各自的跑到上，在做着暖身运动。
The sprinters are in their lanes now. They are doing up some warming-up exercises.
运动员已经上跑道了，他们要做准备活动。
Let's do some warming-up exercises first.
首先让我们做一下热身运动。
What you should pay attention to are the warming-up & relaxion of activities & exercises.
要注意的是长跑前的准备运动和锻炼后的整理放松运动；
After warming-up exercises, the teacher told us the way of long jump and showed us how to do it. Then we followed the teacher and practised one after another.
准备活动完后，老师告诉我们跳远的方法并做了示范，然后我们就跟着老师一个一个地练习。
Warming-up exercises will increase your body temperature, decrease your muscle viscosity, relax your muscles and make your muscles meet required conditions.
准备活动可以升高体温，降低肌肉的粘滞度，放松肌肉，使肌肉达到运动所需的状态。
Warming-up exercises will increase your body temperature, decrease your muscle viscosity, relax your muscles and make your muscles meet required conditions.
准备活动可以升高体温，降低肌肉的粘滞度，放松肌肉，使肌肉达到运动所需的状态。
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