One of the local agility clubs will be offering a NADAC Hoopers class later this summer. While searching for info, I found a video of it.

I guess originally it was supposed to work just like a jumpers course but without jumping. That would be great for puppies, young dogs, or other dogs that you don't want to jump. Upon further investigation I guess the rules have been changing so now it is a lot more complicated than that (several tests within the course). I haven't found a video of anyone running with the new rules though.