Explain THREE ways on how physical activity can benefit your mental
health,​

it has a positive impact on depression, anxiety, etc and It also relieves stress, improves memory, helps you sleep better.

  this riddles' answer is library.

  the "leaves" are a reference to the books' pages that the library contains; the branches are a network of libraries that connect multiple libraries' collections, resources, and items in a system of a common database, integrating them; the branches' organization are a useful management tool for coordinating the multiple collections many libraries have.