Read the passage and fill in the numbered blanks. Regular exercise is good for both the body and the mind. It (1) ____ the heart, improves sleep and helps control weight. Exercise also releases chemicals in the brain that make us feel (2) ____. You do not need an expensive gym; a brisk walk of thirty minutes a day is (3) ____ for most people. The key is to be (4) ____ and make exercise a part of your daily routine.