根据短文内容和所给出的首字母，写出空白处各单词的正确形式（每空一词）。
It’s very important for us to do exercise. The m reason is that can not only help us keep h  , but also help to train a person’s m . What’s more, doing exercise helps us to get good g . We can do exercise whenever we want. And in PE classes, we can do all kof exercise, such as running, jumping, playing basketball and so on.