explain how whitman's word choice and line arrangement in lines 4-8 create a feeling of vitality and motion in this section.

Hi! Unfortunately, your question is incomplete, and that is the reason why I can't give you a specific answer. Anyway, I'll try to guide you to be able to create the correct answer yourself.

Explanation:

You don't mention the name of the poem you are referring to, so the first thing to do is to find Whitman's poem. Read it carefully and sense the tone of it. Then, pay specific attention to lines 4-8 and feel its sense, study each one of the words the author chose and see how those words are essential in creating that feeling. According to the task's description, these lines have a feeling of vitality and motion so, there should be some words that give the reader a sensation of movement, I would say. Words that give the reader the sensation of action. Identify those words and explain in the answer you create how those words transmit those feelings, and study how those words are the base of creating the atmosphere.

Trust yourself, you'll do great!

Good luck!