Our body is an amazing object,26  If you are inactive most of the time,your body will quickly become tired when it should be active.But if you are very active,your body will get used to the hard work,and the work will become easier for you to do.

Physical activity can help people remain active and stay healthy.27  It also helps people sleep better.This is why active students don't complain about being tired.They have a good night's sleep and have the energy to study hard and have fun every day.

Physical activity also makes people look and feel good.Activity burns more calories(卡路里）than just sitting.28 In addition,regular exercise can make your muscles and bones stronger.

There are many factors to look at when you select a new physical activity.The most important is to choose something you enjoy.If you like jumping rope,that is the activity you should do.29  In fact,two days of basketball,three days of swimming,and two days of bicycling can be more fun than jogging every day. 

30  Some skills will improve with practice while others may always be difficult for you.If you enjoy an activity,feel free to do it.No one cares whether you can do it well or not,and you don't need to care about it either.

Whatever activity you choose,remain active.It can make you physically fit and healthy for life.

If you want to become the type of speaker you've always wanted to be,read