Recently, a report found that kids 30 years ago could run faster and longer than kids today. The report found that today’s kids are 15% less healthy than kids from 30 years ago. What does that mean? If you’re a12-year-old girl. You’re not a sports star, but you’ re quite healthy. Your mom was the same kind of kid when she was your age. Now imagine we could have a 500-meter race between you and your mom from 30 years ago. Was it cool? The study shows your mom would run faster than you in the race by 90 seconds. That’s a lot. It was the same for boys. An average (普通的) boy from 30 years ago would beat an average boy today.

The scientists think there are some reasons for the big fall in health. First, nowadays too many kids are overweight (超重). That makes it harder for them to run fast. Second, kids today don’t get enough exercise. Doctors say kids should get at least 60 minutes of exercise a day. That’s why it is important for schools to have P. E. classes.

So what should kids do? If you don’t want your mom and dad to think they are faster than you, don’t spend a lot of time playing games, watching TV or movies online. Instead, try to do some things and it will help to get you up and to move.

Bikesharing is new for short journeys in cities. It is a good choice for the big cities to develop healthily.

A report found that shared bikes started the nation's love for bikes again. The love is not only among young people born in the 1980s and 2000s, but also among people over sixty. Now they are choosing bikes instead of cars to make short journeys in cities. If you have a smart phone, the nearest bike equipped with GPS will be easily found through a certain app on your phone. It can also be unlocked through the app and left anywhere in public for the next user. The cost of riding depends on the time that you spend. Normally, every hour you ride, you just need to pay one yuan.

It is said that bikesharing will help improve the cities' environment. It not only helps solve the traffic problems,   but also will help to make more use of space in cities. Take Beijing as an example. If more people choose shared bikes, an area of five Bird's Nest Stadiums （体育场）will be saved.

At the same time, there are some problems with shared bikes that people need to solve properly. For example, some people park the bikes in their home; some break up the bikes on purpose; and others even throw them into the river. Facing all these problems, everyone should raise their own awareness of protecting the bikes. We should not only enjoy them, but also value them and put them to good use.

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