It's important for us to be healthy all our lives. We can't study or work properly without a healthy body.
There're many ways to keep healthy. First of all, we should keep taking exercises every day. We can walk to school instead of taking a bus. After school, we can relax ourselves by playing basketball and so on. If our home or classrooms stay in high-rise, we can walk upstairs or downstairs. Secondly, we should have a balanced and healthy diet. Finally, we should keep in mind: "Early to bed, early to rise is the way to keep healthy, wealthy and wise."
If we can do in this way, I think all of us will be healthy.