The word it” in paragraph 2 refers to .

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions from 39 to 43.

Obviously, regular exercise can help you improve your strength, stay in good shape, and prevent diseases. But did you know that aside from its physical effects, staying active can also offer you a wide range of mental benefits?

When faced with mental or emotional challenges in life, exercise can help you build resilience and cope in a healthy way, instead of resorting to alcohol, drugs, or other negative behaviors that only worsen your symptoms, It also releases endorphins, powerful chemicals in your brain that energize your spirits and make you feel good. In addition, physical activity can also serve as a distraction, allowing you to find some quiet time to break the cycle of negative thoughts that feed mental health problems like depression.

Even if you are feeling just fine and not suffering from mental health issues, regular exercise can still give you another advantage: a sharper, more active brain. This is because the same endorphins that make you feel better also help you concentrate and feel mentally sharp for tasks at hand. Exercise also stimulates the growth of new brain cells and helps prevent age-related memory decline.

And of course, leading an active lifestyle will significantly boost your self-confidence. Regular activity is an investment in your mind, body, and soul. And when it becomes a habit, it can develop your sense of self-worth and make you feel strong and powerful. You'll feel better about your appearance, and by meeting exercise goals, you'll also feel a sense of achievement and success.

(Adapted from helpguide.org)