题目内容：

Staying Fit While Indoors

During this special time, it's a good idea to do some indoor exercises. Exercising has many benefits. Here are some great ideas to get you started!

 

Run in place. Start by kicking your feet behind you as you run. Then, bring your knees up as high as possible when you feel like you've warmed up. Start by running in place for five minutes. Then, try to run in place for ten minutes.

 

 

Do push-ups to build up your upper body. Begin by getting into a plank position (平板式). Then, bend (弯曲) your elbows and lower yourself toward the floor but do not touch the floor. Start by doing a set of 10, and work your way up to three or four sets.

 

 

Work on mountain climbers. Start by getting into a standard push-up position. Then, bring your left knee to your chest, keeping your arms in place. Replace your left leg and bring your right knee to your chest. Continue to turn legs. Repeat this three times for 30 seconds each set.

 

 

Try jumping jacks. Stand with your feet together and your arms at your side. Then, jump and stretch your arms and feet. Start by doing three sets of 10. Increase the amount (数量) of jumping jacks you do when you feel ready.

 

 

1.Which is the right way to start running in place?

A.By getting into a plank position. B.By kicking your feet behind you.

C.By standing with your feet together. D.By getting into a standard push-up position.

2.Which exercise mainly builds up your upper body?

A.Push-ups. B.Jumping jacks. C.Run in place. D.Mountain climbers.

3.According to the text, how many jumping jacks should you start doing?

A.Two sets of 10. B.Two sets of 20. C.Three sets of 10. D.Three sets of 20.