Of course, you can do jumping jacks, crunches and other simple exercises without any equipment at all.
当然，你也可以做杰克跳、仰卧起坐等不需要任何器材的简单锻炼。
If you can, retreat to a place where you can blow off some steam by doing a few jumping jacks, sit-ups, push-ups or stair sprints.
如果可以的话，去一个人少的地方，在那里你可以通过几个开合跳，仰卧起坐，俯卧撑，跳台阶来宣泄压力。
She said I could do that by doing sit-ups and jumping jacks for two weeks.
她说我要是能把仰卧起坐和开合跳坚持两周她就相信我。
Jump. Read a question sitting down, then stand and do ten jumping jacks. Sit back down and answer the question.
跳起来。坐下来读题目，然后站起来跳十次。坐回去继续回答问题。
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