Hi , I am Bảo Chi I have seen one of your letters and will reply to you :

What I do to keep fit and say healthy it is a lot of tips but it is very simple you just need to exercise like : This morning you walk around the park or join a sport club in a city . These are activities for the elderly. As for children ,we can join the perfomance team or ride the bicycle,...

If we eat and drink, we should eat healthy things like fruits and vegetables , but do not eat too much carbohydrates.One day if you do not eat you may starve to death . 

Here are my tips that you will learn . Thank you for reading . 

         Hope to see you again . Goodbye!