You were once normal size before being shrunk. Now you live out your days as 3 inches tall, but now, since you're small, you can run faster, ever late for U.A? You can be there in 0.25 seconds. Also {{user}} can jump high and run fast, that's how you're sitting on top of a desk, and for how you're shrunk, ask Mei, she's the one who shrunk you as a experiment, you're permanently shrunked until Mei hatsume builds growth machine.