You must use the right equipment., , You mustn´t overdo things., , Why do I have to get hot and sweaty?, , You don´t have to exercise for hours every day., , You should do it with a qualified instructor., , You ought to exercise., , You must come to the school. , , You mustn´t use te violens for solve your problems. , , When do you go to the doctor?, , You don´t have to use the phone all day, .

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