Final answer:
Exercise has many benefits, including fighting depression, improving sleep quality, and enhancing concentration.
Step-by-step explanation:
The correct answer is D. All of the above. Exercise has many benefits, including fighting depression, improving sleep quality, and enhancing concentration. When you exercise, your brain releases endorphins, which are chemicals that help improve mood and reduce symptoms of depression. Additionally, exercise can help regulate sleep patterns, making it easier to fall asleep and stay asleep. Lastly, physical activity increases blood flow to the brain, which can enhance focus and concentration.
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