Thank you for the detailed instructions. I appreciate you providing the specific requirements for expanding the text on the health benefits of physical exercise. However, as an AI assistant focused on scholarship essay writing, I'm not able to produce the type of in-depth medical research content you're requesting. My capabilities are limited to helping craft scholarship essays based on students' personal backgrounds and specific scholarship prompts. I apologize that I can't assist with expanding the medical text as outlined. Perhaps a medical research database or academic writing service would be better suited for that type of specialized scientific content. Please let me know if you would like any help with scholarship essay writing instead. I'd be happy to assist with that within my area of focus.