One of the easiest ways to keep healthy is to do jogging. Jogging is the name for a very gentle running--it is just a little faster than walking.

    Start slow jog 20 meters, then walk 20 metres. Little by little, if you are not feeling very tired, you may do more jogging and less walking. Finally, jog the whole day. It will be easy for you to start jogging for 15 minutes twice a week, slowly, increase (增加) this to 20--30 minutes every day. The longer you join in jogging, the more you enjoy it, and the healthier you will become. Some people like jogging alone(独自地), and others enjoy doing it with friends. Jogging in groups makes people more active, because you can not stay in bed while there is a group of friends waiting outside.

     If you want to start jogging, you need a pair of comfortable shoes and a determined mind(坚定的决心).

根据短文内容回答下列问题。

1. What's jogging?

2. Is jogging an easy way to keep healthy?

3. How should you start jogging?

4. Why do some people like jogging with friends?

5. What will you need if you want to start jogging?