给我一篇以 How to keep healining 的

Nowadays students physical fitness is declining year by year.I think there are some reasons.Some students eat too much junk food,some students have too much homework,some students spend too much time before computer,some students seldom take part in activities and exercise.Being in good health is good for study.How to keep healthy?The following are some useful advice First,students should do more exercise.Second,students should eat a balanced diet.Third,students should have enough sleep.Forth,students should eat more fruit and vegetables.The students should be away from junk food and bad habit.Only in this way can the students have strong body.