众所周知, 健康对每个人都很重要, 怎样保持健康呢?我们可以适当运动, 比如：散步, 游泳等; 吃适量的蔬菜水果; 睡眠充足, 早睡早起等。请你以How to keep heathy?为题写一篇80词左右的短文。

提示：keep healthy, go for a walk, have enough sleep

How to keep healthy?