Letter to my penfriend. Dear Peter, Thank you very much for your letter, I’m glad to hear from you. In my opinion if you want to keep fit you need to do two things, eating good food and doing sport, there aren't anything more to be healthy so you should start soon to do some sports for example, running, walking or swimming, in general something to like you. Also you should eat better for example fruit and vegetables and you shouldn't eat fast food because you can gain weight. I practice sport every days and I feel very well, I hope you be able to practice sport and eat better. See you soon. Manuel