The Unguarded Pipe in the Mushroom Kingdom

I expected them to be some sort of thing where they would say like, Mario, you can play tennis or soccer. But another example of it is how we even get pulled into the Mushroom Kingdom. I feel like in spoilers and in specifics, there are, like, Peaches a Badass. And he only more a lesson that Mario learns in this movie is, uh, mushrooms are good for you. It's just like, I don't... How does that work? Is Peach constantly getting bigger? Because she's always bigger than anyone can use him apparently but no one does.