What do you do to keep fit?  What sport do you go in for?
 Does sport help people to keep fit? Why?
 How do you try to keep fit?
 What people should do to stay healthy?

Объяснение:

1) I go to karate.

2) Because it has a good effect on the body. It also strengthens the muscles.

3) I do karate and do a warm-up every day. 4) Eat healthy and do exercise.