阅读理解

We all need to exercise. Doctors say it is good for us. It makes our bodies strong. It also gives us more energy(能量), and we will feel better. It's best to exercise twice a week. Twenty minutes each time is enough.

There are many ways to exercise. We can walk, run, play sports or swim. Many people go to special places to exercise. These places are called "fitness centers." These places have a lot of equipment(器材). Some people buy equipment for their homes, but it is very expensive.

Exercising can be fun. Friends can exercise together at a fitness center, or they can play sports together. How do you exercise?