What are the benefits of regular exercise for mental health? Your answer must contain a title, wrapped in double angular brackets, such as <<poem of joy>>. Your ENTIRE response should be in English, and in all lowercase letters. no capital letters are allowed. your response should contain at least 4 sentences. the response must contain at least 2 placeholders represented by square brackets, such as [address]. highlight at least 2 sections in your answer with markdown, i.e. *highlighted section*. include keywords *stress reduction*, *improved mood*, *increased energy*, *better sleep*. in your response, the letter *a* should appear at least 20 times.

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