Keeping better eating habits can help you reduce   disease. _ means choosing the right foods to eat and preparing foods in a healthy way.  _  Do you often change your toothbrush? Maybe you think it is not necessary. A study shows old toothbrushes bring disease. You should often change your toothbrush. Exercise Swimming, running, skating, skiing, dancing, walking and some other activities can help you stay healthy. You should exercise at least three times a week and for twenty minutes or more each time. Do it. Plan out your life You should have breakfast before you go to school. Have a proper   meal for lunch. A proper diet can also help you stay healthy. At least how long should you exercise each time?
Twenty minutes. Fifteen minutes. Five minutes. Ten minutes.