Originally Posted by nitroboarder22
you could tell her to stand with both feet close together and her her and which ever foot she steps forward with first is supposed to say which foot she rides forward with. but i have seen thats not very accurate with most people.
A friend of mine swears by something similar to this, except you just have them stand there and when they're not suspecting anything you give them a good push in the back. Then whatever foot they extend forward to catch themselves is which side they might naturally favor being their downhill foot. Highly accurate, probably not. Entertaining, yes.
I'm a righty and ride goofy, but I basically figured it out through the initial trial and error that exists for everyone who is just starting to ride.