They can hang their papers on a wall and stand. Or spread out on a floor and sprawl. Kinesthetic learners do better when they can move around. It doesn't have to be the main idea, or the first. Just an idea.
Kids pick a pen, write the idea in big letters, and circle it.
That's for kids who think in words. But many people think in pictures first, and the words follow. So some kids will be more successful if they start with a quick sketch or cartoon to capture the big ideas, then add words. Repeat the process until the main ideas are all spread out on the paper, like colored targets. It's a visual table of contents for the essay or report.