Go to chao garden of choice (I find it works best in Station Square).
Find worthless chao (almost everyone has one). Pet it while facing it. Jump forward and try to land on chao. Time it right. Press y as soon as you land on it. It may take a few tries. You'll be petting thin air. You can run around like this for as long as you like. You can also let go of y. If you bump an item or go off a ledge you will usually get back you're running stance.
If you don't believe it here is proof:
http://www.youtube.com/watch?v=O92u4jXzHmA
Your account is banned for the time bein' as you do not have the age of 13 yet and will have to provide us parental permission.
This is for your own safety.