Most of us say we don't have time for exercise. However, many experts say that exercise plays an important role in making our body healthy.     1     (do) exercise can bring us many advantages. It can reduce weight and the risk of heart disease. Exercise also brings good effects mentally(精神上).It can make us feel     2    (relax)and happy. Actually, exercise can be done in many simple    3     (way). For example, we can take the stairs rather than the lift. Also we can play sports with friends in our free time.