Let's assume the original article is: "The importance of exercise. Exercise is good for our health. It can make us stronger and more energetic."
Here is the expanded version:
Exercise plays a crucial role in our lives. It is not just a simple activity but a key to maintaining good health. Regular exercise can bring numerous benefits. It helps to strengthen our muscles and bones, making us physically stronger. Moreover, it increases our energy levels, allowing us to be more active and productive throughout the day. In addition, exercise is also beneficial for our mental health. It can reduce stress, anxiety, and depression, and improve our mood and overall well-being. Therefore, we should make exercise a part of our daily routine and enjoy the many benefits it has to offer.