How do I get a rounder body?

The people of Shiveria won't let me race until I get a rounder body. I found the racer who doesn't want to race, and he said anyone can take his place, but everyone says I am too small! How do I get a rounder body so I can race for the multi moon prize?


Like many other entities in the game, you can possess the racer who doesn't want to participate. This will let you enter the race.