I gathered up some trash cans and a box that my husband was about to
cut up into the recycle bin, and set them in a line.
Charm checked out each obstacle (there must have been something edible
in one of the cans as it kept drawing her attention).
We practiced weaving the barrels a couple of times, and then grabbed a
quick video:
http://iceryder.net/charmserpentine.html
She tried to rush past the wrong side of the last obstacle, but took
the correct way at the last second.