Look at some vocabulary for people who choose different lifestyles.  Think about some ideas for keeping healthy - read about one doctor's suggestions.

Listen to part of a radio broadcast where people talk about what they think is the best way to stay healthy and check you know how to express purpose, saying why you should do things.

Read about someone who succeeded in changing his lifestyle quite radically before it was too late! - and is very happy about it and check some phrasal verbs.