As her feet touched the ground Lily dashed off towards the start of the obstacle course. It was a simple set of stairs and not really something that counted as an obstacle. With the reduced size it was simple for her to take the stairs three at a time pulling herself up as she went. It was actually how thin the stairs were that proved even a modicum of a challenge but her balance was more than enough to deal with it. Her wings didn't need to get involved at all, though they were always ready.
When she got to the top, Lily saw that the next obstacle was a series of floating platforms angled slightly. It was clear that a normal person would have to run and jump quickly between them to avoid falling off… but the smaller size meant Lily could just about walk across them. The small size made it hard to find purchase but they were much closer together.
I wonder how many people get the joke in the title? I don't think it's too hard to see... but maybe that's just from the perspective of the one who wrote it.