Why Sh0uld we do exercise?（英语作文）

Nowadays with the development of society.More and more people start exercising.
For example,I play ping-pong ball twice a week.And my father plays basketball once a week.Why do people exercise?Maybe this is a difficult question to the people who do not exercise.As a person who do exercise very often,I want to tell you the reason of exercise.
First,exercises can help us to keep fit.Now many people exercise for becoming thinner than ever before.
Secondly,exercises can also help us to be strong and to fight illness and disease.Maybe it is a good way to keep healthy.
Thirdly,exercises make us enjoy ourselves and build up our skills.It can help us become helpful and friendly.So that we will be welcomed by others.
In a word,some exercise a day keeps the doctor away!Let us go to exercise.
答案纯手打,手指动一下,

为什么应该我们做运动？？