Jack is good at sports. Jack exercises every morning, and he comes back from school on foot every evening. He often says,” It's important to exercise.” So he is very healthy. He often eats fruit and vegetables. Her thinks they are good for his health. He never eats snacks, biscuits, cakes or some other sweet snacks(甜点), because the sweet food isn't healthy. Jack loves watching TV. He watches TV over 4 hours every day. And he goes to sleep very late. He sleeps for 6 hours every night. It's not enough. He knows that it isn't good for his health. He plans to change it.