Week 6 -Task 1 - Keeping your bones young

http://www.cnn.com/video/

Everybody wants to have a good health. When we are old our bones will be weak . It's easy to be hurt if you have weak bones . Bones is very important for active of people. How to keep our bones young ? Exercising is the best way to do it ;moreover, exercises also help impro your health . Walking , runing are useful exercises . We should avoid drink coffee, alcohol...