It is very important to keep fit and stay healthy. Firstly, you should have a balanced diet. For example, you ought to eat more vegetables, fruits and avoid eating fast food. Secondly, doing exercise regularly is also a way to stay healthy. For instance, you can play volleyball, walk or go swimming every morning. Moreover, doing exercise will help you stronger, more active and prevent a lot of diseases. Last but not least, you should take enough sleep. You'd better sleep 6 to 8 hours a day because it will boost your mind in the morning and help to refresh your body.

1.I think it is flu,so to prevent the flu we have to take good care of ourshelves.First, we have to eat healthily ,we should eat healthy food like vegetables,fruit,grains...Second,we have to do exercise everyday.Besides,we shoudn't stay up late. Finally,we have to reduce stress ,too.

2.I often get up early and do exercise in the morning.I also drink 2 liters of water everyday,and eat healthy food like vegetables and fruit.I seldom eat fast food  such as pizza or hamburger. I keep fit and stay healthy by doing the activities above.